the height of a right cylinder is 3 times the radius of the base. the volume of the cylinder is 24cubic units,
what is the height of the cylinder?

What’s the answer ? use the picture to see the problem

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.

Can someone show me step by step how to do this?