1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
klasskru [66]
3 years ago
12

The life of light bulbs is distributed normally. the standard deviation of the lifetime is 25 hours and the mean lifetime of a b

ulb is 590 hours. find the probability of a bulb lasting for at most 622 hours. round your answer to four decimal places.
Mathematics
1 answer:
Dominik [7]3 years ago
4 0
The probability is 0.8997.

We will use a z-score to answer this question.  z-scores are given by the formula
z=\frac{X-\mu}{\sigma}

With our information, we have
z=\frac{622-590}{25}=\frac{32}{25}=1.28

Looking this up in a z-table (http://www.z-table.com) we see that the area to the left of this (everything less than, up to this value) is 0.8997.
You might be interested in
N is a positive integer.Explain why n(n-1) must be an even number.
V125BC [204]

Answer:

n and (n - 1) are consecutive integers.

Step-by-step explanation:

We are given 'n', a positive integer.

This 'n' can either be odd or even.

Case I:

When 'n' is odd

The n - 1 is even.

Note that the product of odd and even is always even. That is the product of n and (n - 1) is even.

Case II:

when 'n' is even

Then n - 1 is odd.

Again, using the similar logic we can say that the product of n and n - 1 should be even because here, 'n - 1' is even and 'n' is odd.

4 0
3 years ago
***I NEED HELP PLEASE***
sergey [27]

Answer:

on a graph or a number line

Step-by-step explanation:

7 0
3 years ago
Write an expression that can be used to multiply 6x198 mentally
Black_prince [1.1K]
6(100+90+8) is the equation
6x100 =600
  6x90 =540
    6x8  = 48
             1,188 is the answer                                      



7 0
3 years ago
Read 2 more answers
Is H with an exponent of 2, be the same as h x h?
Elis [28]
Yes. This is because if you multiply 2 variables together you can make an exponent available. Also, you could do h to the first power plus h to the first power which would equal h ²
4 0
3 years ago
Read 2 more answers
The center of a circle is at the origin. and endpoint of a diameter of the circle is at (-3, -4. how long is the diameter of the
Aleks [24]
The diameter is 10:

To do this we must use the distance formula:

Distance =√(x2−x1)^2+(y2−y1)^2

So, if we substitute in our values for the origin and endpoint (origin is 1 values, endpoint is 2)

D=✓(-4-0)^2+(-3-0)^2

Simplified, this is

D=✓16+9
D=✓25
D=5

so, the distance from the center of the crcle to the endpoint is 5 (making the radius)

multiply by two, and the diameter of the circle is 10 :)
4 0
2 years ago
Other questions:
  • So your the number 4 on your calculator and you need to get 40 how do you get it
    14·1 answer
  • A shipment of 20 DVDs has arrived at a video rental store. Based on past experience, the manager knows that 10% of all new DVDs
    11·1 answer
  • What is 2a/3 + 1/5=7/6 for a equation ? what does a represent?
    6·2 answers
  • 10<br>-25 please answer​
    11·1 answer
  • One vertex of an equilateral triangle is at the origin and the other vertex is at (3,4)
    12·2 answers
  • A grain silo is in the shape of a cylinder. The area of the circular roof is 803.84 square feet. If 13,665.28 cubic feet of grai
    6·1 answer
  • Find the volume of a sphere if its radius is 6 cm. Use estimation for pi.
    7·1 answer
  • Miss lynch's dog, jax weighs 12 times as much as Mrs. Vetterly's dog coco. There combined weight is 78 pounds. How much does jax
    13·2 answers
  • Consider the two functions:
    7·1 answer
  • What is the length of the side opposite the 60° angle?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!