The lifetime of a light bulb in a certain application is normally distributed with mean (mu=1400) hours

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The lifetime of a light bulb in a certain application is normally distributed with mean $\mu=1400$ hours and standard deviation $\sigma=200$ hours.

a. What is the probability that a light bulb will last more than 1800 hours?

b. Find the 10th percentile of the lifetimes.

c. A particular light bulb lasts 1645 hours. What percentile is its lifetime on?

d. What is the probability that the lifetime of a light bulb is between 1350 and 1550 hours?

e. Eight light bulbs are chosen at random. What is the probability that exactly two of them have lifetimes between 1350 and 1550 hours?

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Statistics For Engineers And Scientists

ISBN: 9780073107677

6th Edition

Authors: William Navidi

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Question Posted: Jan 28, 2024 01:01 AM

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The lifetime of a light bulb in a certain application is normally distributed with mean (mu=1400) hours

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Heres how you can approach these problems Note In a normal distribution the symbol Z is used to represent a standard score also known as a zscore A Zs...View the full answer

Statistics For Engineers And Scientists

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