Answer:
Step-by-step explanation:
A psychologist has developed a test called “WETHIC” to measure the work ethic in a firm’s
workers. The test scores approximate a Normal distribution with a mean of 70 and a standard
deviation of 20. (note: this step involves manual calculation and does not require any SPSS work).
For each question, your answer should take the form of a complete sentence.
1. Convert a WETHIC score of 79 into a z-score and interpret this z-score.
2. Convert a WETHIC score of 62 into a z-score and interpret this z-score.
3. What proportion of workers will have a WETHIC score that is below 79?
4. What proportion of workers will have a WETHIC score that is below 62?
5. What proportion of workers will have a WETHIC score that is above 79?
6. What portion of workers will have a WETHIC score that is above 62?
The WETHIC score of 79 into a z-score is 0.33.
A WETHIC score of 62 into a z-score is 0.80.
The proportion of workers that will have a WETHIC score that is below 79 is 63%.
The proportion of workers that will have a WETHIC score that is below 62 is 21%.
How to calculate the value1) Z score = (79-74)/15 = 0.33 , it means score is 0.33 standard deviations above the mean
2) Z score = (62-74)/15 = -0.80 , it means score is 0.80 standard deviations below the mean
3) P(X<79)
= P(Z<0.33)
= 0.6293
d) P(X<62)
= P(Z<-0.80)
= 0.2119
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sue sells rings for 6$ each. Her expenses are $2.50 per ring, plus $56 for supplies. How many rings does she need to sell for her revenue to equal her expenses? Show work to support your answer
Sue needs to sell 16 rings to make her revenue equal to her expenses
What is revenue?Revenue is the total income generated by a company or organization from its sales or operations. It is the amount of money that a business earns from selling its products or services, or from other sources such as investments or interest on deposits.
According to question:Let's assume that Sue sells x rings.
The revenue generated by selling x rings = $6x
The total expenses for selling x rings = $2.50x + $56
To find the number of rings that Sue needs to sell for her revenue to equal her expenses, we need to set the revenue equal to the expenses and solve for x.
6x = 2.5x + 56
Subtracting 2.5x from both sides, we get:
6x - 2.5x = 56
Simplifying the left side, we get:
3.5x = 56
Dividing both sides by 3.5, we get:
x = 16
Therefore, Sue needs to sell 16 rings to make her revenue equal to her expenses.
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need help with this question when somebody can, thanks.
Answer:
140inch^2
Step-by-step explanation:
5×8=40inch^2
4^2×π= 16π
4^2×π=16π
16π+16π=32π
40+32π=140.53096491487
rounded to the nearest 10th= 140inch^2
Solve Picture Below (its pretty ez)
Answer:
It's y = 3x + 1 :)
Line l has a slope of −3. The line through which of the following pair of points is perpendicular to l? hint: slope will be 1/3
A. (−6,−4),(−3,−3)
B. (−18,−1),(−3,0)
C. (−2,−3),(−3,−6)
D. (−4,−3),(−3,−6)
Answer:
A (-6, -4),(-3,-3)
Step-by-step explanation:
Formula for slope of a line is y2-y1/x2-x1
If you plug each equation in:
-3-(-4)/-3-(-6)=1/3
1/3 is the perpendicular slope of -3
If x= 2-√3, then x + 1/x equals a) 4 b) 2+√3 c) 4-√3 d) 1/(2+√3)
Answer:
Step-by-step explanation:
To find x + 1/x, we need to first find the value of x.
Given, x = 2-√3
To simplify x + 1/x, we need to find the value of 1/x.
1/x = 1/(2-√3)
Multiplying the numerator and denominator by the conjugate of the denominator, we get:
1/x = (2+√3)/(2-√3)(2+√3)
1/x = (2+√3)/(4-3)
1/x = 2+√3
Now, substituting the values of x and 1/x, we get:
x + 1/x = (2-√3) + (2+√3)
x + 1/x = 4
Therefore, the answer is option a) 4.
Find the average rate of change of f(x) = x² - 4x + 1 from x=3 to x = 5.
Simplify your answer as much as possible.
To find the average rate of change of the function f(x) = x² - 4x + 1 from x=3 to x = 5, we need to find the difference in f(x) between these two values and divide by the difference in x:
f(5) - f(3) / (5 - 3)
= (5² - 4(5) + 1) - (3² - 4(3) + 1) / 2
= (25 - 20 + 1) - (9 - 12 + 1) / 2
= (6) / 2
= 3
Therefore, the average rate of change of f(x) from x=3 to x=5 is 3.
Step-by-step explanation:
Given a interval x=a to x=b, the average rate of change is equal to
[tex] \frac{f(b) - f(a)}{b - a} [/tex]
where [a,b] is the interval.
Here
a is 3
b is 5 so
[tex] \frac{f(5) - f(3)}{5 - 3} [/tex]
Using the function
[tex]f(5) = 25 - 20 + 1 = 6[/tex]
[tex]f(3) = 9 - 12 + 1 = - 2[/tex]
So
[tex] \frac{6 - ( - 2)}{5 - 3} = 4[/tex]
The average rate of change of f from x=3 to x=5 is 4
Please explain this problem to me?
The answer is 140m squared
A triangular prism has a volume of 1950 cm?. The height of the triangle is 13 cm, and the height of the prism is 20 cm. What is the perimeter of the triangle (assuming all the sides are equal)?
The perimeter of the triangle is therefore P= 45 cm.
What is a triangular prism?A triangular prism is a prism composed of two triangular bases and three rectangular sides. It is a pentahedron.
What is perimeter?The perimeter of a shape is defined as the total distance around the shape. It is the length of the outline or boundary of any two-dimensional geometric shape.
We know that the volume of a prism is given by
V = Bh, where B is the area of the base and h is the height of the prism. In this case, we have V = 1950 cm³ and h = 20 cm.
So, we can solve for B:
B = V/h = 1950/20 = 97.5 cm².
The base of the triangular prism is a triangle with height 13 cm, so we have
B = 1/2bh = 1/2(13)(b) = 97.5.
Solving for b, we get b = 2B/h = 2(97.5)/13 = 15 cm.
Since all sides of the triangle are equal, we have b = c = 15 cm.
The perimeter of the triangle is therefore P = 3b = 3c = 3(15) = 45 cm.
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1. Nathaniel hikes 15 4/5 kilometres on a
three-day hiking trip.He hikes 3 kilometre
on the first day.Then
Nathaniel hikes the same distance on
the second and third days of his trip.
Determine the distance Nathaniel hikes
on the second and third days.
Nathaniel hikes 6 2/5 kilometers on each of the second and third days of his hiking trip.
Calculating the distance hiked on the second and third daysIf Nathaniel hikes a total of 15 4/5 kilometers on a three-day hiking trip and he hikes 3 kilometers on the first day, then he must hike the remaining distance on the second and third days.
To find out how much Nathaniel hikes on the second and third days, we can start by subtracting the distance he hikes on the first day from the total distance he hikes:
15 4/5 - 3 = 12 4/5 kilometers
Since Nathaniel hikes the same distance on the second and third days, we can divide the remaining distance by 2 to find out how much he hikes on each of those days:
12 4/5 ÷ 2 = 6 2/5 kilometers
Therefore, Nathaniel hikes 6 2/5 kilometers on each of the second and third days of his hiking trip.
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Quadrilateral MATH has coordinates M(-6,-3), A(-1,-3), 7(-2,-1), and H(-4,-1). The image of
quadrilateral MATH after the composition r x-axis °T 7,5 is quadrilateral M "A"T"H". State and
label the coordinates of M"A"T"H".
the coordinates of M"A"T"H" are M"(1,8), A"(6,2), T"(5,4), and H"(3,4).
How to find?
The composition r x-axis ° T(7,5) first reflects the quadrilateral MATH about the x-axis and then translates it 7 units to the right and 5 units up.
To find the image of M(-6,-3) after reflection about the x-axis, we flip the sign of the y-coordinate to get M'(-6,3). Then, we translate M' 7 units to the right and 5 units up to get the coordinates of M":
M" = T(7,5) ∘ M' = (7 + (-6), 5 + 3) = (1, 8)
Similarly, we can find the coordinates of A", T", and H":
A' = (-1, 3) → A" = T(7,5) ∘ R(x-axis) ∘ A' = (7 + (-1), 5 - 3) = (6, 2)
T' = (-2, 1) → T" = T(7,5) ∘ R(x-axis) ∘ T' = (7 + (-2), 5 - 1) = (5, 4)
H' = (-4, 1) → H" = T(7,5) ∘ R(x-axis) ∘ H' = (7 + (-4), 5 - 1) = (3, 4)
Therefore, the coordinates of M"A"T"H" are M"(1,8), A"(6,2), T"(5,4), and H"(3,4).
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Solve the system.
x + y = 2
x – y = 0
Both equations are true when x = 1 and y = 1, so the solution is correct.
What are system of equations ?
A system of equations is a set of two or more equations that are to be solved simultaneously. The equations in the system share common variables, and the solution to the system is a set of values for those variables that satisfy all of the equations in the system.
To solve this system, we need to find the values of x and y that satisfy both equations at the same time. This means that any solution we find must work in both equations simultaneously.
According to the question:
To solve the system:
x + y = 2 ...(1)
x - y = 0 ...(2)
We can add equations (1) and (2) to eliminate y:
(x + y) + (x - y) = 2 + 0
2x = 2
x = 1
Substituting x = 1 into equation (1):
1 + y = 2
y = 1
Therefore, the solution to the system is x = 1 and y = 1. We can check the solution by substituting the values into both equations
x + y = 2
1 + 1 = 2 (true)
x - y = 0
1 - 1 = 0 (true)
Both equations are true when x = 1 and y = 1, so the solution is correct.
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Solve for x. Round to the nearest tenth, if necessary
Answer: a
Step-by-step explanation:
In the triangle, x = 3. Find y.
Responses
A y = 3√
y = 3
B y = 6y = 6
C y = 7y = 7
D y = 32√
y = 3 2
E y = 62√
y = 6 2
Answer:
3√2
Step-by-step explanation:
9 + 9 = 18
square root of 18 is
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85% de 1560 90% de 158 138% de 1610 50% de 230
f(x) = x + 1, g(x) = 7x + 8 find (fog)(x)
Answer:
(fog)(x) = 7x + 9.
Step-by-step explanation:
To find (fog)(x), we need to first find the composition of f and g, which is given by f(g(x)).
So, we substitute g(x) into f(x) and simplify:
f(g(x)) = f(7x + 8)
= (7x + 8) + 1 (using the definition of f(x))
= 7x + 9
Therefore, (fog)(x) = 7x + 9.
A regular star is equilateral and has congruent angles at the vertices and congruent angles at each indentation. Given the following examples of regular stars, give a rule for the number of lines of symmetry in a regular star. In two or more complete sentences, justify the rule.
Answer:
they have equal shape calculate the number
Find all unknown measures in the triangle
The value of the unknown sides and angles are;
<B = 65 degrees
b = 27
c= 13
How to determine the angles and sidesIn the triangle, Using the SOHCAHTOA rule,
such that
sin θ = opposite/hypotenuse
cos θ = adjacent/hypotenuse
tan θ = opposite/adjacent
From the diagram shown, we have that;
sin C = c/30
sin 25 = c/30
find the value and cross multiply, we get;
c = 12. 67
< B = 180 - sum of angle A and C
<B = 180 - 115
subtract the values
<B = 65 degrees
The value of side b
sin B = b/30
sin 65 = b/30
b = 27. 19
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Answer two questions about point
A
Astart color #9e034e, start text, A, end text, end color #9e034e on the number line below.
A vertical number line labeled 7.5 to 7.6 with tick marks every one hundredth unit. Point A appears slightly above tick mark 7.51.
A vertical number line labeled 7.5 to 7.6 with tick marks every one hundredth unit. Point A appears slightly above tick mark 7.51.
What is
A
Astart color #9e034e, start text, A, end text, end color #9e034e rounded to the nearest hundredth?
What is
A
Astart color #9e034e, start text, A, end text, end color #9e034e rounded to the nearest tenth?
the rounded color remains the original colour:: 9e034e
The color code #9e034e represents a shade of deep pink or magenta. To round this color to the nearest tenth, we need to convert the hexadecimal code to its corresponding RGB values and then round those values.
Converting #9e034e to RGB gives us (158, 3, 78).
Rounding each of these values to the nearest tenth gives us (158, 3, 78), which is the same as the original color. Therefore, the rounded color is still #9e034e.
As for the mention of "A" in the question, it's unclear what context it refers to. If it's related to the color, it might mean that the color is used to represent the letter "A" in a certain context. However,
The question doesn't provide enough information to determine the exact meaning of "A."n summary, the rounded color #9e034e remains the same as the original color, and the mention of "A" in the question is unclear.
Determine all pairs of real numbers a and b so that the following function, f(x),
is differentiable at all real values, x.
f(x) =
x- x^2, if x ≤ 1
x^2 - 5x + 4/ square root ax, if 1
sin(x-4)/x+b, if x > 4
1.Using the Chain Rule, show that the following statements are always true:
(a) If f(x) is an odd function then f'(x) is an even function.
(b) If f(x) is an even function then f’(x) is an odd function.
If f(x) is an odd function then f'(x) is an even function, a=7 and b=5.
What are functions?A relation is any subset of a Cartesian product.
As an illustration, a subset of is referred to as a "binary connection from A to B," and more specifically, a "relation on A."
A binary relation from A to B is made up of these ordered pairs (a,b), where the first component is from A and the second component is from B.
Every item in a set X is connected to one item in a different set Y through a connection known as a function (possibly the same set).
A function is only represented by a graph, which is a collection of all ordered pairs (x, f (x)).
Every function, as you can see from these definitions, is a relation from X.
According to our question-
dy/dx = f'(x) = limΔx→0f(x+Δx)−f(x)Δx lim Δ x → 0
Hence, If f(x) is an odd function then f'(x) is an even function, a=7 and b=5.
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Please help I’ve been absent and am confused on this topic!! Can someone tell me if I got this geometry question right? If not please solve for x, simplify to radical form, and explain how you got your answer.
The value of x= 4.
What is trignometric ratios?This is the boundary or contour length of a 2D geometric shape.
Depending on their size, multiple shapes may have the same circumference. For example, imagine a triangle made up of wires of length L.
The same wire can be used to create a square if all sides are the same length.
The length covered by the perimeter of the shape is called the perimeter. Therefore, the units of circumference are the same as the units of length.
As we can say, the surroundings are one-dimensional. As a result, you can measure in meters, kilometers, millimeters, etc.
Inches, feet, yards, and miles are other globally recognized units of circumference measurement.
According to our question-
cos(60)= x/8
x=1/2*8
x=4
Hence, The value of x= 4.
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Write the following in interval notation: x>-28
Answer:
[tex]( - 28 \infty )[/tex]
Step-by-step explanation:
We have already found the solution to the inequality, but since we want to represent the solution in interval notation, we have changed it.
hopefully this helps! :)
Suppose the number of glasses of water people drink
in a week is normally distributed with a mean of 50 and
a standard deviation of 5 glasses of water.
Find the probability a given person drank between 40 and 45
glasses of water.
2.35%
35
40
13.5%
45
34% 34% 13.5%
50
P = [?]%
55
60
2.35%
65
Enter
The probability that a given person drank between 40 and 45 glasses of water is 13.5%.
What is Probability ?
Probability can be defined as ratio of number of favourable outcomes and total number outcomes.
between 40 and 45 glasses of water.
First, we need to standardize the values of 40 and 45 using the z-score formula:
z1 = (40 - 50) / 5 = -2
z2 = (45 - 50) / 5 = -1
Next, we look up the area under the standard normal distribution curve between z = -2 and z = -1. We can use a standard normal distribution table or a calculator to find this area, which is approximately 0.135.
Therefore, the probability that a given person drank between 40 and 45 glasses of water is 13.5%.
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2+2 is 4 but 4+4 is 8 what is this math property?
The Commutative Property of Addition is the mathematical principle at play here. we can see that [tex]2 + 2 = 4[/tex] and [tex]4 + 4 = 8[/tex] , and this is due to the Commutative and Associative Properties of Addition.
What is the Commutative Property of Addition?The math property at work here is the Commutative Property of Addition. This property states that the order of the numbers being added does not affect the sum. In other words, a + b = b + a.
So, in the case of [tex]2 + 2 = 4[/tex] and [tex]4 + 4 = 8[/tex] , we can apply the Commutative Property of Addition to rearrange the numbers being added:
[tex]2 + 2 = 4[/tex]
[tex]4 + 4 = 4 + (2 + 2)[/tex]
Then, we can use the Associative Property of Addition, which states that the grouping of the numbers being added does not affect the sum. In other words, ([tex]a + b) + c = a + (b + c).[/tex]
Applying this property to [tex]4 + (2 + 2)[/tex] , we get:
[tex]4 + (2 + 2) = (4 + 2) + 2 = 6 + 2 = 8[/tex]
Therefore, we can see that [tex]2 + 2 = 4[/tex] and [tex]4 + 4 = 8[/tex] , and this is due to the Commutative and Associative Properties of Addition.
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two fractions that are the same size as 3/10
Answer:
6/20 and 9/30
Step-by-step explanation:
Part C
Now you will attempt to copy your original triangle using only two of its sides and the included angle:
Using point E as the center, draw a circle with a radius equal to the length of
, which you calculated in part B.
Using point E as the vertex and
as one side of the angle, create an angle that is equal to the measure of
. Draw ray
.
Locate the intersection of the ray and the circle, and label the point F.
Complete
by drawing a polygon through points D, E, and F.
Take a screenshot of your results, save it, and insert the image below.
We want to copy the original triangle using only two of its sides and the included angle. To do this, we'll create a new triangle with the same side lengths and angle measures as the original triangle.
To copy a triangle using two of its sides and the included angle, follow these steps:
Using point E as the center, draw a circle with a radius equal to the length of side DE.Using point E as the vertex and side DE as one side of the angle, create an angle that is equal to the measure of angle D.Draw ray EF that extends from point E through the angle you created in step 2.Locate the intersection of ray EF and the circle you drew in step 1, and label the point of intersection F.Complete the triangle DEF by drawing a line segment that connects points D, E, and F.Learn more about vertex :
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Find the total surface area of this triangular prism. 21 cm 20 cm 29 cm 22 cm
Answer:
ти можеш загуглити в інтернеті, і все
-6x+6y=6
-6x+3y=-12
Answer:
-6x + 6y = 6 (Equation 1)
-6x + 3y = -12 (Equation 2)
We can use the method of elimination, which involves adding or subtracting the equations to eliminate one of the variables.
In this case, we can start by multiplying Equation 2 by 2 to eliminate the x variable:
-6x + 6y = 6 (Equation 1)
-12x + 6y = -24 (Equation 2 multiplied by 2)
Now we can subtract Equation 1 from Equation 2:
-12x + 6y = -24 (Equation 2 multiplied by 2)
-(-6x + 6y = 6) (Equation 1, with the opposite sign)
-6x = -30
Simplifying this expression, we get:
x = 5
Now we can substitute this value of x into either Equation 1 or Equation 2 to solve for y. Let's use Equation 1:
-6x + 6y = 6
-6(5) + 6y = 6
-30 + 6y = 6
6y = 36
y = 6
Therefore, the solution to the system of equations is x = 5 and y = 6, or (5, 6) in coordinate form.
Step-by-step explanation:
The National Park Service writes materials for students to use while in the parks. In a study of the effectiveness of some of these materials, a random sample of students was selected to take a short quiz about oak trees after using these materials. A random sample of park professionals also took the quiz. Investigators compared classifications (low, medium, and high) of the crown shapes—the general shapes of the leafy parts of the trees—made by students in s 6 through 12 with classifications made by professionals. Data from the study are shown in the table.
ProfessionalsStudentsTotalLow544397Medium483987High7916Total10991200
If the professionals and the students do not differ in the distributions of their responses, which of the following is equal to the expected number of students who classify the crown shapes as medium?
The expected number of students who classify the crown shapes as medium is approximately 38.3.
What is statistics?
Statistics is a branch of mathematics that deals with the collection, analysis, interpretation, presentation, and organization of numerical data.
To find the expected number of students who classify the crown shapes as medium, we need to use the assumption that the distributions of responses from the professionals and the students are the same. We can use the row and column totals to calculate the expected counts.
First, let's calculate the marginal totals for the students:
The total number of students is 91.
The total number of students who classified the crown shapes as low is 43.
The total number of students who classified the crown shapes as medium is 39.
The total number of students who classified the crown shapes as high is 9.
Now let's calculate the expected counts for the students who classified the crown shapes as medium:
The total number of classifications for the medium category is 87 (from the table).
The proportion of classifications in the medium category made by the professionals is 48/109.
The expected number of classifications in the medium category made by the students can be calculated as (proportion from professionals) x (total number of student classifications) = (48/109) x 87 = 38.3 (rounded to one decimal place).
Therefore, the expected number of students who classify the crown shapes as medium is approximately 38.3.
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Homeowners are installing a pollinator garden in
the corner of their backyard. The garden has the in
dimensions shown.
on
°538 = 33 feet
es
22 feet
104°
A
B
%
Part A
A fence will be installed along the entire edge, c,
of the area. What is the length of fence that will
be installed to the nearest tenth of a foot?
16
24
C
Part B
The homeowners will plant wildflowers to cover
the garden. If one packet of wildflower seeds covers
9 ft², how many packets of seeds will they need to
cover the entire garden?
36
(D) 48
Using sine and cosine rule, the length of fence is 19.84 feet and the number of packets to cover the garden is approximately 48
What is the length of fence c?To find the value of of the length of the fence, we can either use sine rule or cosine rule.
Since we have two sides and an angle, we sine rule first
a/sin A = b / sin B
[tex]\frac{33}{sin 104} = \frac{22}{sin B} \\sin B = 0.6469\\B = 40.31^0[/tex]
Using this, we can find the value of angle C
A + B + C = 180 degrees
Reason: Sum of angles in a triangle is equal to 180 degrees
104 + 40.31 + C = 180
C = 35.69 degrees
We can proceed to use cosine rule to find the length of the fence.
[tex]c^2 = a^2 + b^2 -2(a)(b)cosC\\c^2 = 33^2 + 22^2 - 2(33)(22)cos35.69\\c^2 = 393.71\\c = 19.84 ft[/tex]
Part B
Since one packet will cover 9ft², we need to know the total area of the field to determine the number of packets required.
Using heron's formula;
[tex]s = \frac{a + b + c}{2} \\s = \frac{33 + 22 + 29.84}{2} \\s = 42.42\\[/tex]
The area of the field is
[tex]A = \sqrt{s(s-a)(s-b)(s-c)}\\A = \sqrt{42.42(42.42-33)(42.42-22)(42.42-19.84}\\A = 429.24ft^{2}[/tex]
The number of packets will be
x = 429.24 / 9
x = 47.69≅48 packets
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