?Suppose that the talk time on the Apple iPhone is approximately normally distributed
Chapter 7, Problem 6(choose chapter or problem)
Suppose that the talk time on the Apple iPhone is approximately normally distributed with mean 7 hours and standard deviation 0.8 hour.
(a) What proportion of the time will a fully charged iPhone last at least 6 hours?
(b) What is the probability a fully charged iPhone will last less than 5 hours?
(c) What talk time would represent the cutoff for the top 5% of all talk times?
(d) Would it be unusual for the phone to last more than 9 hours? Why?
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