It is estimated that 0.54 percent of the callers to the Customer Service department of Dell Inc. will receive a busy signal. What is the probability that of today's 1,300 callers at least 5 received a busy signal?

Answers

Answer 1

Using the binomial distribution, it is found that there is a 0.8295 = 82.95% probability that at least 5 received a busy signal.

What is the binomial distribution formula?

The formula is:

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]

The parameters are:

x is the number of successes.n is the number of trials.p is the probability of a success on a single trial.

In this problem:

0.54% of the calls receive a busy signal, hence  p = 0.0054.A sample of 1300 callers is taken, hence n = 1300.

The probability that at least 5 received a busy signal is given by:

[tex]P(X \geq 5) = 1 - P(X < 5)[/tex]

In which:

P(X < 5) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4).

Then:

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

[tex]P(X = 0) = C_{1300,0}.(0.0054)^{0}.(0.9946)^{1300} = 0.0009[/tex]

[tex]P(X = 1) = C_{1300,1}.(0.0054)^{1}.(0.9946)^{1299} = 0.0062[/tex]

[tex]P(X = 2) = C_{1300,2}.(0.0054)^{2}.(0.9946)^{1298} = 0.0218[/tex]

[tex]P(X = 3) = C_{1300,3}.(0.0054)^{3}.(0.9946)^{1297} = 0.0513[/tex]

[tex]P(X = 4) = C_{1300,4}.(0.0054)^{4}.(0.9946)^{1296} = 0.0903[/tex]

Then:

P(X < 5) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4) = 0.0009 + 0.0062 + 0.0218 + 0.0513 + 0.0903 = 0.1705.

[tex]P(X \geq 5) = 1 - P(X < 5) = 1 - 0.1705 = 0.8295[/tex]

0.8295 = 82.95% probability that at least 5 received a busy signal.

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Related Questions

Forty pounds of candy is distributed in 5/7 lb bags. How many bags can be filled?
_______ bags can be filled.

Answers

Answer:56 bags

Step-by-step explanation:

you are dividing 40 into 5/7 so its technically 40*7 divided by 5, which equals 56. double check by doing 56*5 divided by 7 and you get 40 pounds,

[tex]\frac{40(7)}{5}[/tex]Answer:

To find out how many can be filled, divide the number of pounds of candy by the number of pounds a single bag can hold.

40 can be considered 40/1.

So,

40/1 ÷ 5/7

Make 5/7 a reciprocal(basically flipping the fraction upside down):

40/1 ÷ 7/5

Convert the division symbol into a multiplication symbol:

40/1 × 7/5

Solve!

[tex]\frac{40(7)}{5}[/tex]

Cancel:

[tex]\frac{8(7)}{1}[/tex]

= 56 bags can be filled.

Help Me On This!!

[tex] \\ \\ \\ [/tex]

Answers

Answer:

First Find the Radius of Cake by dividing 40/2

Now Find Area of the cake of Bottom

And Then Use the Formula to calculate volume of Circle

Cross Section Area=π Square

Bole of Circle 4/3π× radius cube

Answer:

24,727.5 cm³

Step-by-step explanation:

Information to keep in mind

r₁ = 20 cm (bottom layer)r₂ = 20/2 = 10 cm (middle layer)r₃ = 10/2 = 5 cm (top layer)h (of each layer) = 15 cm

Formula of a cylinder

V = πr²h

Volume (total)

V = πr₁²h + πr₂²h + πr₃²hV = πh (r₁² + r₂² + r₃²)V = 3.14 x 15 ([20]² + [10]² + [5]²)V = 47.1 (400 + 100 + 25)V = 47.1 (525)V = 24,727.5 cm³

On a camping trip you bring 12 items for 4 dinners. For each dinner you use 3 items. In how many ways can you choose items for the first dinner? for the second? for the third? for the fourth?

Answers

Answer:

220 options, 84 options, 20 options, 1 option

Step-by-step explanation:

The first dinner

Combinations of 3 out of 12 items

12C3 = 12!/(12-3)!3! = 12!/9!3! = 12*11*10/2*3 = 220The second dinner

Combinations 3 out of remaining 9 items

9C3 = 9!/(9 - 3)!3! = 9!/6!3! = 9*8*7/2*3 = 84The third dinner

Combinations of 3 out of remaining 6 items

6C3 = 6!/(6 - 3)!3! = 6!/3!3! = 6*5*4/2*3 = 20 The fourth dinner

Combinations of 3 out of 3 remaining items

3C3 = 3!/(3 - 3)!3! = 3!/0!3! = 1

Larry owns an automobile dealership. Last week, he received a shipment of 160 automobiles.
He now has 938 automobiles for sale. How many automobiles did Larry have before the
shipment?

Answers

Larry had 778 automobiles before he had the shipment.

At a Harare swimming club, there are 35 girls and 25 boys. . In a Bulawayo swimming club, there are 22 girls and 14 boys. Which swimming club has the greatest proportion of girls? Explain how you worked out your answer. ​

Answers

Answer:

  Bulawayo

Step-by-step explanation:

Proportions can be compared numerous ways. Here, we find it convenient to look at the difference between girls and boys relative to the number of boys.

__

Harare

With 35 girls and 25 boys, there are 10 more girls than boys. 10 is less than half of the number of boys, so the ratio of girls to boys is less than 1.5.

Bulawayo

With 35 girls and 15 boys, there are 8 more girls than boys. 8 is more than half of the number of boys, so the ratio of girls to boys is more than 1.5.

Comparision

"More than 1.5" is greater than "less than 1.5", so Bulawayo has the greatest proportion of girls.
_____

Additional comment

As a fraction of the total, the proportions of girls are ...

  Harare: 35/(35+25) = 35/60 = 7/12 = 21/36

  Bulawayo: 22/(22+14) = 22/36 . . . . . . greater than 21/36.

What is the surface area of this design?
400in
256in
640in
384in

Answers

Answer:

I don’t know

Step-by-step explanation:

Explanation: the answer is 348 inches because it is

you build a two-person tent, as shown. How many square feet of material is needed to make the tent, assuming the tent has a floor?​

Answers

The material is needed to make the tent, assuming the tent has a floor would be equal to 36/√3.

What is a triangular prism?

Connect three rectangles edge to edge. Now close their triangular mouths from both ends. That shape is called a triangular prism.

Let the tent width be w and the given Length is 6 feet.

[tex]tan\theta = \dfrac{opposite }{adjecent} \\\\tan60 = \dfrac{h}{w/2} \\\\\sqrt{3} = \dfrac{6}{w/2} \\\\\sqrt{3} = \dfrac{12}{w} \\\\w = \dfrac{12}{\sqrt{3} }[/tex]

[tex]sin60 = \dfrac{opposite }{hypotenuse} \\\\sin60 = \dfrac{6}{x}\\\\x = \dfrac{6}{\sqrt{3}/2 }\\\\x = \dfrac{12}{\sqrt{3} }[/tex]

The area of the front tent =

[tex]\dfrac{1}{2} \times base \times height\\\\\dfrac{1}{2} \times w\times h\\\\\\\dfrac{1}{2} \times 12/\sqrt{3} \times 6\\\\\dfrac{36}{\sqrt{3} }[/tex]

The area of the back tent is also the same.

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On Saturday, the fruit and juice bar was selling 21 glasses of fruit punch an hour. By 4 p.m., they had sold 126 glasses. If their goal was to sell more than 252 glasses of fruit punch, find the number of hours, h, they must stay open to make their goal.
A.
h > 12
B.
h > 8
C.
h > 6
D.
h > 14

Answers

Answer:

option C, 6

Step-by-step explanation:

If we subtract 252 - 126

we get 126 then divide by 21 to get 6.

therefore 6 hours

edit: If you liked my answer Brainlist Please.

PLSSSS HELPPPPPPPPPPPPPPPPPP

Answers

Answer:

[tex]\huge\boxed{\sf Option \ 1}[/tex]

Step-by-step explanation:

People surveyed = 42

People who approved = 25

So, the sample is:

25 residents who approve.

And population:

42 residents surveyed.

[tex]\rule[225]{225}{2}[/tex]

Which of the following scenarios MUST represent two independent events?

P(blue) = 20%, P(green) = 60%, P(blue and green) = 13%

P(blue) = 40%, P(green) = 30%, P(blue and green) = 13%

P(blue) = 70%, P(green) = 30%, P(blue and green) = 21%

P(blue) = 80%, P(green) = 20%, P(blue and green) = 18%

Answers

Answer: C) P(blue) = 70%, P(green) = 30%, P(blue and green) = 21%

Step-by-step explanation:

Given probabilities P(A) AND P(B) are independent, the probability that both events to occur is given by:

P(A)∩P(B)

thus from the example, independent events will be:

P(blue)=70%, P(green)=30%, P(blue and green)=21%

Because:

P(blue)∩P(green)=0.7×0.3=0.21=21%

(10 : 2) • 3 = 10 · (2 - 3)
O A. True
O B. False

Answers

Answer:

I have got an answer it is false for explanation go to picture

PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE


Solve cos 0 = 1 for 0, where 0º = 0 < 90°.

A) 60°
B) 0°
C)90
D)30

Answers

Answer:

to you in 1980 is the lol in lol1234in lol to you in the kids in the lero girl

combine the like terms to create an equivalent expression
-3z - z

Answers

Answer:

Coefficient 1.2. Exponent 1.3. Variable or Base

Step-by-step explanation:

Please Help!!!!
Using the slope​ formula, find the slope of the line through the given points. (12,0) and (2,-5)

Answers

Answer: The slope is 1/2

Step-by-step explanation:

Calculate the rise (change in y-component) divided by the run (change in x-component).

rise = 0 - (-5) = 5

run = 12 - 2 = 10

slope = 5/10 = 1/2

Find the determinant of this matrix:
[tex]\left[\begin{array}{ccc}0&1\\1&0\end{array}\right][/tex]

Answers

Answer:

-1

Step-by-step explanation:

Formula to the determinant is:

[tex]\left[\begin{array}{ccc}a&b\\c&d\end{array}\right] = ad-bc[/tex]

0(0)–1(1)

0-1

-1

Answer:

-1

Step-by-step explanation:

Formula: ad-bc

0(0) - 1(1)

0-1

-1

3. Find the probability that a point chosen randomly inside the rectangle is in each given shape. Round to
the nearest hundredth.

Answers

Answer:

20% probability

Step-by-step explanation:

First, we need to calculate the area of all the figures inside the rectangle.

Area of triangle= 1/2 BH

So, 3x2=(6)

Area of Square= L^2

3x3=(9)

Area of rectangle= LxW

=60.

60+9+6= 75.

75 is the total area.

Now, lets find the added area of only the triangle and square.

9+6= 15

The probability will be 15/75=

Convert into percent form

= 20%

Hope this helps and please mark me brainliest :)

Answer:

20% probability

Step-by-step explanation:

20% probability

20% probability

20% probability

20% probability

The speed of the jet Alyssa flew on from Boston to London was 480 mph. On her return flight, the speed of the jet was 600 mph with a tail wind. What was Alyssa's average speed on the round trip? Round your answer to one decimal place.

Answers

Answer:

533.3mph

Step-by-step explanation:

The graph of g(x) = f(x + 2) + 3 is the graph of y = f(x) shifted

Answers

Answer:

The graph of f(x) = x² was transformed to create the graph of g(x) = f(x) + 1.5. Which statement about the graphs is true?

The vertex of the graph of g is 1.5 units to the left of

the vertex of the graph of f.

B

The y-intercept of the graph of g is 1.5 units above the

y-intercept of the graph of f.

The graph of g is a reflection of the graph of f across

the y-axis.

The graph of g is a reflection of the graph of f across

the x-axis.

Step-by-step explanation:

The cost of buying a small piece of land in a remote village since the year 1990 is represented by the following table: Time (years) Cost (thousands of dollars) 0. 30 36.9 44.1 51.1 57.9 65.1 21 4 6 8 10

which modle for C(t), the cost of the piece of land t years since 1990, best fits the data?

C(t) = 30 × (1.23)^t
C(t) = 30 + 7t
C(t) = 30 + 3.5t
C(t) = 30 × (1.12)^t​

Answers

Answer:

Step-by-step explanation:

C(t)=30+3.5t

hope this help yw and can i get brainly pls

What is the measure of XYZ?
A. 56.5

Answers

Answer:

it is 113*

Step-by-step explanation:

hat is the measure of XYZ?

Given: r(x) = x3 - 7, k(x) = 5 ln (2x) Find: (k ○ r) (x)

Answers

The value of (k ○ r) (x) from the given parameters in the task content is; 5 ln(2x³ -14)

What is (k ○ r) (x) from the task content?

If follows from the task content that;

r(x) = x³ - 7 and k(x) = 5 ln (2x)

It therefore follows that;

(k ○ r) (x) = k(r(x)) = 5 ln (2(x³-7)).

On this note, the expression which represents (k ○ r) (x) is; 5 ln(2x³ -14).

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What is the following product?

3 StartRoot 2 EndRoot (5 StartRoot 6 EndRoot minus 7 StartRoot 3 EndRoot

Answers

The answer to this question is C

1.3 as a mixed number ​

Answers

Answer: 1 3/10

Step-by-step explanation:

first turn it into a fraction 13/10 then how many times does 13 fit into 10. It fits once with 3 remaining. So you get 1 and 3/10

Answer:

  1 3/10

Step-by-step explanation:

When you read the decimal number, it reads the same as the equivalent mixed number:

  1.3 = "one and three tenths" = 1 3/10

__

Additional comment

This will generally be the case. Some mixed numbers found this way can have their fractions reduced:

  1.2 = "one and two tenths" = 1 2/10 = 1 1/5

Find the surface area of this rectangular prism. Be sure to include the correct unit in your answer.

Answers

Answer:

the answer is in the picture

Ms. King wants to add a triangular deck in
the yard behind her house. Each side is to be
18 feet long. Find the length of the railing
that will fit completely around the deck.
Then find the area of the deck.

Answers

Look we’re it says 13

The length of the railing that will fit completely around the deck is 54 feet. The area of the triangular deck is approximately 164.25 square feet.

To find the length of the railing that will fit completely around the triangular deck, we need to calculate the perimeter of the triangle. The perimeter of a triangle is the sum of the lengths of all three sides.

Since each side of the triangular deck is 18 feet long, the perimeter (P) can be calculated as:

P = 18 feet + 18 feet + 18 feet

P = 54 feet

So, the length of the railing that will fit completely around the deck is 54 feet.

Next, let's find the area of the triangular deck. The area of a triangle can be calculated using the following formula:

Area (A) = (1/2) * base * height

Since the triangle is equilateral (all sides have the same length), any side can be considered as the base, and the height can be drawn from any vertex to the midpoint of the opposite side.

Let's consider one of the sides (18 feet) as the base. Now, to find the height, we can draw a perpendicular line from the vertex to the midpoint of the base, creating two right-angled triangles.

The height (h) of one right-angled triangle can be found using the Pythagorean theorem:

[tex]h^2 = (18 feet / 2)^2 + (18 feet)^2\\h^2 = 9 feet^2 + 324 feet^2\\h^2 = 333 feet^2\\[/tex]

h ≈ √333 feet

h ≈ 18.25 feet (rounded to two decimal places)

Now, we can find the area (A) of the triangular deck:

A = (1/2) * base * height

A = (1/2) * 18 feet * 18.25 feet

A ≈ 164.25 square feet (rounded to two decimal places)

So, the area of the triangular deck is approximately 164.25 square feet.

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50 points each question. Please help. How do I solve?

Answers

Answer:

[tex]\dfrac{dy}{dx}=-y\left(4+\dfrac{1}{x}\right)[/tex]

or written in rational form:

[tex]\dfrac{dy}{dx}=\dfrac{-4xy-y}{x}[/tex]

Step-by-step explanation:

[tex]\ln(xy)+4x=45[/tex]

[tex]\textsf{Apply the product log law}\quad\ln(ab)=\ln(a)+\ln(b):[/tex]

[tex]\implies \ln(x)+\ln(y)+4x=45[/tex]

[tex]\textsf{Add}\:\dfrac{d}{dx}\:\textsf{in front of each term}:[/tex]

[tex]\implies \dfrac{d}{dx}\ln(x)+\dfrac{d}{dx}\ln(y)+\dfrac{d}{dx}4x=\dfrac{d}{dx}45[/tex]

[tex]\textsf{Differentiate the}\: x \: \textsf{terms and constant terms first}:[/tex]

[tex]\implies \dfrac{1}{x}+\dfrac{d}{dx}\ln(y)+4=0[/tex]

[tex]\textsf{When differentiating with respect to}\:y,\: \textsf{differentiate and add}\: \dfrac{dy}{dx}:[/tex]

[tex]\implies \dfrac{1}{x}+\dfrac{1}{y}\dfrac{dy}{dx}+4=0[/tex]

[tex]\textsf{Rearrange to make}\:\dfrac{dy}{dx}\:\textsf{the subject}:[/tex]

[tex]\implies \dfrac{1}{y}\dfrac{dy}{dx}=-4-\dfrac{1}{x}[/tex]

[tex]\implies \dfrac{dy}{dx}=y\left(-4-\dfrac{1}{x}\right)[/tex]

[tex]\implies \dfrac{dy}{dx}=-y\left(4+\dfrac{1}{x}\right)[/tex]

If you want it in rational form, then:

[tex]\implies \dfrac{dy}{dx}=-4y-\dfrac{y}{x}[/tex]

[tex]\implies \dfrac{dy}{dx}=\dfrac{-4xy-y}{x}[/tex]

[tex]~~~~~\ln(xy) +4x = 45\\\\\\\implies \dfrac{d}{dx} \left[\ln(xy) +4x \right] = \dfrac{d}{dx} ( 45)\\\\\\\implies \dfrac{1}{xy} \cdot \dfrac{d}{dx} (xy) + 4 = 0\\\\\\\implies \dfrac 1{xy} \left( x\dfrac{dy}{dx} + y \right) +4 =0\\\\\\\implies x\dfrac{dy}{dx} + y + 4xy=0\\\\\\\implies x \dfrac{dy}{dx} =-y-4xy\\\\\\\implies \dfrac{dy}{dx} = \dfrac{-y-4xy}x[/tex]

PLEASE HELP I WILL GIVE 40 pts

Answers

Answer:

option C is the answer

Step-by-step explanation:

I think it will help you

What is the radius of a sphere with a volume of 320 ft 3 , to the nearest tenth of a foot?

Answers

Answer:

A=10240033.0/pift /ft

Step-by-step explanation:

Calculate the area of circle:

Round the number: A=10240033.0/pift /ft

Answer: A=10240033.0/pift /ft

The radius of the sphere is 4.2 feet.

What is a Sphere?

A sphere is a geometrical shape in three dimension which has every point on the surface of it at an equal distance from a common point called the center of the sphere.

Volume of a sphere is given by the equation,

Volume = [tex]\frac{4}{3}[/tex]πr³, where r is the radius.

We have volume of the given sphere = 320 feet³

Substituting this value in the main equation, we get,

320 =  [tex]\frac{4}{3}[/tex]πr³

320 × 3 = 4πr³

960 / 4π = r³

960 / (4 × 3.14) = r³

r³ = 76.43

r = 4.24 ≈ 4.2

Hence, the radius of the sphere with a volume of 320 feet³ has a radius of 4.2 feet, to the nearest tenth of a foot.

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Question 1 (6 points) Retake question ✓ Saved
Anthony's sink is shaped like a half-sphere, and it has a volume of 512n cubic inches.
It is completely full of water, and he has two different cylindrical cups he can use to
scoop it out.
The blue cup has a diameter of 4 in. and a height of 8 in., and the green cup has a
diameter of 8 in. and a height of 8 in.. How many cupfuls of water will it take for him
to empty his sink using each cup?
In your answer, give the number of cupfuls it will take to empty the sink using each
cup, and then explain how you calculated it.

Answers

Answer:

The green would take 4 and the blue would take 16 times respectivly.  I did it by finding the volumes of the cups in terms of pi, then dividing it by the volume of the sink.

Step-by-step explanation:

So the volume of the whole half sphere is 512pi.

Now we have to find the volumes of the cup.

Equation: [tex]\pi r^2h[/tex]

Blue cup:

[tex]\pi 2^2(8)\\\pi 4(8)\\\pi 32[/tex]

It would take 16 times to drain it completly.

Green cup:

[tex]\pi 4^2(8)\\\pi 16(8)\\\pi 128[/tex]

It would take 4 times to drain it completly.

50 points please help

The ceiling of Stacy's living room is a square that is 22 ft long on each side. Stacy knows the diagonal of the ceiling from corner to corner must be longer than 22 ft, but she doesn't know how long it is.

Solve for the length of the diagonal of Stacy's ceiling in two ways:

(a) Using the Pythagorean Theorem.

(b) Using trigonometry.

Round each answer to the nearest whole number and make sure to show all your work. (Hint: the answers should be the same!)

Answers

#a

H²=P²+B²

P and B are sides of square

H²=22²+22²H²=484+484H²=968H≈22√2ftH≈31ft

#b

Apply cosines

cos45=22/H1/√2=22/HH=22√2ft=31ft
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