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
Who knows cus I certainly do not
Licemer1 [7]
Pretty sure the answer you're looking for is A
8 0
3 years ago
Fifty six students sing up to volunteer for the race . There were 4 equal groups of students , and each group had a different ta
andrey2020 [161]
There were 14 students per group.
8 0
3 years ago
Maximum for n=100x 40y
Greeley [361]
Assuming that here are the choices : 
(0,0)
(5,0)
(0,8)
(2,6)

In a question like this, you just need to input the x and the y to the equation and find out which have the greatest n.

From the following above , the answer would be : (5,0)

Hope this helps
6 0
3 years ago
I am the largest number that rounds to 241.699 when rounded to the nearest thousandth. What number am I? Please explain how you
slava [35]
For the answer to the question above asking <span>the largest number that rounds to 241.699 when rounding to the nearest thousandth. What number am I? I think the a</span><span>nswer  is 241.6994 (241.6995 would be rounded UP to 241.700).
</span>I hope my answer helped you.
4 0
3 years ago
45x=180;x=4<br><br> a. yes<br><br> b. no,x=6<br><br> c. no,x=2
sveta [45]
I hope this helps you

5 0
3 years ago
Other questions:
  • 8% of what number is 2
    15·1 answer
  • John gave Peter 2/5 of his CDs
    15·1 answer
  • 10-(3x-1)/2=(6x+3)/11<br> If someone could help that would be great thank you!
    6·1 answer
  • A factory has fixed costs of $1,275 per month. The cost of producing each unit of its product is $2.50. Each unit sells for $10.
    15·2 answers
  • Write 806000000 in scientific notation
    7·2 answers
  • A grocery store sells 6 pounds of apples for $4. How much will 8 pounds of apples cost? Round your answer to the nearest cent.
    6·1 answer
  • PLEASE HELPPPPP FASSSTT
    15·1 answer
  • What is 87 percent of 1000
    7·2 answers
  • Expand<br> (2x – 3)^4 <br> Someone help please
    14·1 answer
  • Find the volume of this sphere.<br> Use 3 for T.<br> d=6in<br> V ~ [?]in3<br> V = Tr3
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!