Solve a cylinder of radius r cm and height h cm has a curved surface area A cm, where
a) obtain a formula for h
b) find the value of h when A = 93 ,R = 2.5 and = 3.1

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.