Suppose that the talk time on a fully charged iPhone is approximately normally distributed with mean 7 hours and standard deviation 0.8 hour. (a) What is the probability that a fully charged iPhone...

Suppose that the talk time on a fully charged iPhone is approximately normally
distributed with mean 7 hours and standard deviation 0.8 hour.
(a)  What is the probability that a fully charged iPhone will last less than 6 hours?
(b)  Simple random samples of 16 fully charged iPhones are obtained. Describe the sampling
distribution of x, the mean talk time of the sample. In other words, comment on the shape, center
(calculate the mean), and spread (calculate the standard deviation) of the distribution.
Shape:
Center:
Spread:
(c)  What is the probability that a random sample of 16 fully charged iPhones results in a mean talk
time of less than 6 hours?