Posted by Peggy 10 months ago In:

,

Peggy
Peggy Asked:

Probability

A brand of television has a lifetime that is normally distributed with a mean of 7 years and a standard deviation of 2.5 years.  What is the probability that a randomly chosen TV will last more than 8 years?

Liked this question? Tell your friends about it

2 Answers

Order by
Oldest to Newest
Newest to Oldest
Votes
PGroot
PGroot Answered:

The mean is 7 years, so there is .5 probability that it will last 7 years or more.

The standard deviation is 2.5, so one additional year is 1/2.5 = 0.4 S.D.

The probability that it will fail in that additional year is the probability table entry for 0.4 S.D. = .155 so the probability that it will last 8 years or more is .5 - .155 = .345 

Add a comment Report
Bonestructure
Bonestructure Answered:

My last TV, a Mitsubishi, lasted 15+ years.

If a little knowledge is a dangerous thing, then that makes me a burning truck filled with TNT hurtling through a rocket fuel depot.
Add a comment Report

Related Questions

Other people asked questions on similar topics, check out the answers they received:

Anonymous

Asked: What is the mathematical term for 9 squared ...

what is the mathematical term for 9 squared multiplied by b squared equals c squared?
  • Posted 5 months ago
Caitlyn

Asked: Science Fair??

What are some creative ideas for the science fair?? I really want to win this year so give me some creative and original ideas. I also dont want "too easy" ideas. Anyway, I need project ideas for the ...
  • Posted 4 months ago
PatM

Asked: Mathematical terms

in what year was the mathematical term "prime" introduced
  • Posted by PatM 2 years ago

More Questions

Probabilities

The probability of zero errors is .9^10 =.3487 and the probability of one error is .9^9 x .1 x 10 ways = .3874, total (to 3 places) .736

Probability Work.

I could help you out. Let me know the problems you need help with.

Three digits are randomly selected without ...

I am a bit rusty on probability, so I hope this is correct Part I Consider the divisibility by 3 (exactly) before thinking about probability. a) If a 9 is not selected numbers like 169, 196, 619, 691, 916, and 961 are possible ways to select 3 digits. None of these are divisible by 3 b) If a 6 ...

Dating: Is it probable that a "good" phone conversation yields a "bad

Hi, It all depends. You can have good conversation but then when you meet face-to-face you find out that you don't have a lot in common. A lot of time though, if one had good phone conversarion , then the face -to-face meeting is successful too.

Science & Mathematics

More