Suppose that the talk time on the Apple iPhone is approximately normally distributed with mean 9 hours and standard devi

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Suppose that the talk time on the Apple iPhone is approximately normally distributed with mean 9 hours and standard devi

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Suppose That The Talk Time On The Apple Iphone Is Approximately Normally Distributed With Mean 9 Hours And Standard Devi 1
Suppose That The Talk Time On The Apple Iphone Is Approximately Normally Distributed With Mean 9 Hours And Standard Devi 1 (30.09 KiB) Viewed 117 times
Suppose that the talk time on the Apple iPhone is approximately normally distributed with mean 9 hours and standard deviation 1.2 hours. (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 11.5 hours? Why?
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