Unformatted text preview: nitor and record the lifetimes of a sample of 80 iPhones,
(a) What is the probability that the mean of the sample is larger than 950 days? (b) What is the probability that the mean of the sample is between 875 and 900 days? Standard Normal RVs
A Normal RV that has mean and variance is called a Standard Normal RV. The importance of Standard Normal RVs has to do with the following fact:
(1) If is a Normal RV with mean and variance then is a Standard Normal RV. That is, we can always obtain a Standard Normal RV (and thus work with the probability density function
of a standard normal RV) if we have a Normal RV. All this leads to...
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 Spring '14
 Prof.Kovtun
 Statistics, Central Limit Theorem, Normal Distribution, Variance, Probability theory, iPhones, normal RV, standard normal rv

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