The amount of time a certain brand of light bulb lasts is normally distribued with a
mean of 1100 hours and a standard deviation of 75 hours. Out of 965 freshly installed
light bulbs in a new large building, how many would be expected to last less than
1100 hours, to the nearest whole number?

Answers

Answer 1

Answer:

Therefore, the interval of hours that represents the lifespan of the middle 68% of light bulbs is 1210 hours - 1390 hours.

Step-by-step explanation:

In statistics, the 68–95–99.7 rule, also recognized as the Empirical rule, is a shortcut used to recall that 68%, 95% and 99.7% of the values lie within one, two and three standard deviations of the mean, respectively.

Then,

P (µ - σ < X < µ + σ) = 0.68

P (µ - 2σ < X < µ + 2σ) = 0.95

P (µ - 3σ < X < µ + 3σ) = 0.997

he random variable X can be defined as the  amount of time a certain brand of light bulb lasts.

The random variable X is normally distributed with parameters µ = 1300 hours and σ = 90 hours.

Compute the interval of hours that represents the lifespan of the middle 68% of light bulbs as follows:

Thus, the interval of hours that represents the lifespan of the middle 68% of light bulbs is 1210 hours - 1390 hours.


Related Questions

PLEASE HELP I NEED QUICK!!!

Answers

5 cups of rice if you look at 1 1/3 it says 5 1/3 cups can be made so 5 cups of rice

3/4 cups of dry rice can make 3 cups cooked rice

1 cup dry ice can make

3÷3/43×4/34cups

In circle H with m/GHJ = 70 and GH = 10 units, find the length of arc GJ.
Round to the nearest hundredth.

Answers

Answer:

GH8 remains 70 and gh remains 10

Step-by-step explanation:

there is no five or more


The right circular cylinder represented below has a base radius of
3 centimeters and a height of 12 centimeters.
12 cm
3 cm
the right circular cylinder in cubic

Answers

Answer:

108π

Step-by-step explanation:

volume of a cylinder = πr²h , where r = radius and h = height

given values

radius = 3height = 12

==> plugging in given values into formula

V = πr²h

r = 3 , h = 12

V = π(3²)(12)

==> evaluate exponent

V = π(9)(12)

==> multiply 9 and 12

V = 108π

Mia has two cylindrical bird feeders. Her red bird feeder has a diameter of 10 inches and is 8.3 inches tall. What is the volume of the red bird feeder?

Answers

The volume of the red bird feeder will be equal to V=651.88 cubic inches

What is volume?

Volume is defined as the space occupied by any object in the three-Dimensions. All three parameters are required for the volume like length,width and height of the cube or Cuboid.

It is given that:-

Diameter = 10 inches

Height =  8.3 inches

Volume=?

Since the feeder is cylindrical so the volume will be calculated as:-

[tex]\rm Volume=\dfrac{\pi }{4}d^2H\\\\\\Volume=\dfrac{\pi }{4}(10)^2(8.3)\\\\\[/tex]

V=651.88 cubic inches

Hence volume of the red bird feeder will be equal to V=651.88 cubic inches

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Find it please and give a step by step explanation. Thank you

Answers

Assuming you took Pythagoras, congruency, u should solve it like that

The linear inequality y <-2/3+ 2 is graphed. Which is a solution for the inequality

Answers

Answer:

C. (0;0).

Step-by-step explanation:

(0;0) only.

if to substitute the given coordinates into the given inequality and calculate the result, then the left side equals to the right side. Except (0;0).

Alannah picked out 10 apples that cost a total of $5. On her way to the checkout counter, she decided she really wanted 12 apples. If all the apples are the same price, how much will Alannah pay for 12 apples? Explain how each child came up with their answer?

Answers

6 dollars for 12

Step-by-step explanation:

if she paid 5 dollars for 10, you would do 10/ 5 which would get you 2 dollars per apple so she would pay 6dollars for 12 apples

How can you estimate and compare square roots?

Answers

Answer:

To estimate the square root of a number, you're going to use:

Multiplication knowledge to find the whole numbers you are working betweenRulerNumberlineSentence form

Get as close as possible to the number you're trying to square root by finding two perfect square roots that give a close number.

Please help with the problems

Answers

Answers:
3. B ; 160
4. D ; 72
5. C ; 16 Pounds

Explanation:
3 : 240 - 80 = 160
4 : Just replace the W with all the options and see which fit and that equals 12.
5 : 44 - 28 = 16

Answer:

3) B. 160

4) D. 72

5) C. 16

Step-by-step explanation:

3) 240 - 80 = 160

4) 12 = w/6

w = 6*12

w = 72

5) 44-28 = 16

How does the graph of f(x) = -4^5x - 3 differ from the graph of g(x) = -4^5x?

A. The graph of f(x) is shifted three units to the right of the graph of g(x).

B. The graph of f(x) is shifted three units down from the graph of g(x).

C. The graph of f(x) is shifted three units up from the graph of g(x).

D. The graph of f(x) is shifted three units to the left of the graph of g(x).

Answers

Using translation concepts, it is found that the correct option is given by:

B. The graph of f(x) is shifted three units down from the graph of g(x).

What is a translation?

A translation is represented by a change in the function graph, according to operations such as multiplication or sum/subtraction in it's definition.

In this problem, the parent function is:

[tex]g(x) = -4^{5x}[/tex]

The translated function is:

[tex]f(x) = -4^{5x} - 3[/tex]

3 was subtracted from the original function, which means that the translated function was shifted 3 units down, and option B is correct.

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Please help I am struggling really bad thank you so much

Answers

Answer:

1) A

2) A

3) C

Step-by-step explanation:

Answer: B, A, A

Step-by-step explanation:

I'm not 100% sure this is the answer sorry if I'm wrong

Find the length of X
and show the work. ​

Answers

Answer:

5.641 = x

Step-by-step explanation:

Work on the right triangle

pythag theorem

9^2 + L^2 = 10^2

L = sqrt 19

then x = 10 - sqrt 19 =5.641

What are the solutions of the equation y = -2x square + 9x - 4

Answers

Answer:

x = (-1±i√3)/2

Step-by-step explanation:

y = -2x² + 9x - 4

x = (-b±√(b²-4ac))/2a

x = (2±√((-2)²-4(-1)(-4))/2(-2)

x = (2±√(4-16))/-4

x = (2±√-12)/-4

√-12 = √12 x √-1

√12 = √4√3

2i√3

x = (-1±i√3)/2

Solve for Unknown: x/10=24/39.

Do not put variable, only put the number value to the nearest whole number.

Answers

Answer:

6

Step-by-step explanation:

When you have a proportion (fraction=fraction), you can crossmultiply to solve. See image.

Help!
The length and width of a wooden box are shown above. If the volume
of the wooden box is 64 cubic inches, what would be the height

Answers

Answer:

2 inches is the height of the box.

Step-by-step explanation:

Whats the sum of integers from -100 to 30

Answers

Answer:

-4585

Step-by-step explanation:

Which of the following sets does not contain any irrational numbers?
PICTURE OF SETS SHOWN BELOW.

Thank you so much

Answers

Answer:

C

Step-by-step explanation:

infinite numbers

pi

square root of 80

^all irrational

the graph of y=sin x and y=cos x are identical except for a horizontal shift

Answers

I think it will be 31

solve by completing the square

Answers

Step-by-step explanation:

[tex] {x}^{2} + 2x - 2 = 0[/tex]

Now Adding three on both sides we get

[tex]{x}^{2} + 2x - 2 + 3 = 0 + 3[/tex]

[tex] {x}^{2} + 2x + 1 = 3[/tex]

[tex] {(x + 1)}^{2} = 3[/tex]

Tutorial
A line passes through the points (0, -8) and (-9, -9). What is its equation in slope-intercept
form?

Answers

Answer: y=1/9x-8

Explanation: m= (y2-y1)/(x2-x1)
(-9 - -8) / (-9 - 0) = -1 / -9 = 1/9

1/9x is the slope

B = -8 since it’s x value is 0

So in y=Mx+b form the solution is
Y=1/9x-8

Answer:

[tex]\boxed{\sf{y=\dfrac{1}{9}x-9}}[/tex]

Step-by-step explanation:

To find:

Passes through the points of (0,-8) and (-9,-9).

To use:

The slope and slope-intercept form formula.

Given:

The slope of a line is often indicated by the letter m.

It can be calculated by selecting any two points on the line and calculating the rate of change between them.

[tex]\underline{\text{Slope:}}[/tex]

[tex]\Longrightarrow: \sf{\dfrac{y_2-y_1}{x_2-x_1}}[/tex]

y2=(-9)y1=(-8)x2=(-9)x1=0

Solve.

[tex]\Longrightarrow: \sf{\dfrac{-9-\left(-8\right)}{-9-0}=\dfrac{-1}{-9}=\boxed{\sf{\dfrac{1}{9}}}[/tex]

The slope is 1/9.

Slope-intercept form:

All points (x,y) on the line have m slope and (0,b) y-intercept that satisfy the equation.

⇒ y=mx+b, y=b+mx and y=mx+c

The m represents the slope.

The b represents the y-intercept.

The y-intercept is -8.

[tex]\Longrightarrow: \boxed{\sf{y=\dfrac{1}{9}x-8 }}[/tex]

Therefore, the correct answer is y=1/9x-8.

I hope this helps, let me know if you have any questions.

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There is some algebra in it I think! Thanks!! (I’ll add extra points and brainly just ask:)

Answers

Answer:

C. 27

Step-by-step explanation:

27 + 23 = 50

:)

Answer: hii :)

i know this oneeeee ^^ your answer is 27 <3

Step-by-step explanation:

Move all terms not containing x to the right side of the equation.

hopefully this helps you

- Matthew ~

A graph that uses bars of various heights to represent the frequencies.

a. Histogram

b. Pie graph

c. Bar graph

d. Picto graph

Answers

A graph that uses bars of various heights to represent the frequencies is a Histogram

A histogram is an approximate representation of the distribution of numerical data. The term was first introduced by Karl Pearson. To construct a histogram, the first step is to "bin" (or "bucket") the range of values—that is, divide the entire range of values into a series of intervals—and then count how many values fall into each interval.

Therefore, a graph that uses bars of various heights to represent the frequencies is a Histogram

GRAPH

================================

[tex] \large \sf \underline{Question:}[/tex]

A graph that uses bars of various heights to represent the frequencies.

================================

[tex] \large \sf \underline{Answer:}[/tex]

[tex] \qquad \qquad \huge \bold{Option \: A}[/tex]

================================

[tex] \large \sf \underline{Explanation:}[/tex]

A graph that uses bars of various heights to represent the frequencies is called Histogram

A Histogram is typically a statistical schematic diagram which bars are displayed at random with no space interval. The bars of a Histogram are side-by-side, there are no spaces between the bars.

================================

Five more than a number p is less than 17.

Answers

Answer:

2x-15

Step-by-step explanation:

Found it on a Phrase translator to equations.

Graph the function y = x+2+5. Which point lies on the graph?

A-
(-2,5)

B-
(3,6)

C-
(7,6)

D-
(0,5)

Answers

Answer:

A

Step-by-step explanation:

Given equation :

y = x + 2 + 5y = x + 7

Evaluating the options

A (-2, 5)

5 = -2 + 75 = 5Correct!

Suppose that a gated community consisting of 40 houses requires:

500 liters of water everyday for common utilities of the community, and
a certain amount of water everyday per house.
Assuming that the water tanker supplies no more than 4500 liters of water per day to this community, what is the maximum amount of water that can be used by each house on a daily basis?

liters

Answers

The maximum amount of water that can be used by each house on a daily basis is 100 liters.

How to calculate the amount of water?

From the information given, the gated community consists of 40 houses and requires 500 liters of water everyday for common utilities of the community.

The maximum amount of water that can be used by each house on a daily basis will be:

4500 = 40x + 500

40x = 4500 - 500

40x = 4000

x = 4000/40

x = 100

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help i don't get it??​

Answers

Answer:

attached image

Step-by-step explanation:

Formula:

Discount = Regular price x (% / 100)        

you divided by 100 to change it into a decimal

Sale Price = Regular price - Discount

What is the value of the rational expression below when xis equal to 4?
x-12/x-8

Answers

Answer:

= -7

Step-by-step explanation:

given x = 4

12/4 = 3

4 - 3 - 8 = -7

6. If sin e √√3 2 60° 120° 240° 420° which could not be the value of 0?​

Answers

The only value of the angles that could not be the value of the θ is determined as 240⁰.

Value of sinθ

If sinθ is given as [tex]\frac{\sqrt{3} }{2}[/tex], then the value of θ is determined as follows;

sinθ = √3/2

sinθ = 0.866

θ = sin⁻¹(0.866)

θ = 60⁰

Other possible values of θ

When the angle is translated in radians, θ  = π/3 = 180/3 = 60⁰

thus, θ  = π/3

2(π/3) = 2(60) = 120⁰

using the following formula, we can obtain the rest;

θ = π/3 + 2πk

when k = 1;

θ = π/3 + 2π(1)

θ = 60 + 2(180)

θ = 420⁰

Thus, the only value of the angles that could not be the value of the θ is determined as 240⁰.

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Find the vertex of the parabola y=x^2 + 5x + 10

Answers

The coordinates of the vertex of the given parabola [tex]y=x^2+5x+10[/tex] will be [tex](\dfrac{5}{2},\dfrac{15}{4})[/tex].

What is the vertex of a parabola?

Vertex of the parabola is the point of intersection of symmetry axis of the parabola and the parabola itself.

The given equation of parabola is [tex]y=x^2 + 5x + 10[/tex].

To get the coordinates of vertex of this parabola, we have to write the equation of parabola in the standard form.

So, write the equation of parabola in its standard form as,

[tex]y=x^2 + 5x + 10\\y=x^2+2\times \dfrac{5}{2}x+\dfrac{25}{4}-\dfrac{25}{4}+10\\y=(x-\dfrac{5}{2})^2+\dfrac{15}{4}\\(y-\dfrac{15}{4})=(x-\dfrac{5}{2})^2[/tex]

The standard form of parabola is,

[tex]y-b=(x-a)^2[/tex] where (a, b) is the coordinate of the vertex.

So, by comparing the equations, the vertex of the parabola will be [tex](\dfrac{5}{2},\dfrac{15}{4})[/tex].

Therefore, the coordinates of the vertex of the given parabola [tex]y=x^2+5x+10[/tex] will be [tex](\dfrac{5}{2},\dfrac{15}{4})[/tex].

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Find the volume of this please

Answers

Answer: 436.8

Step-by-step explanation:

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