I dont know how to do this can somebody help me out

Mr. walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

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.

What ia the sum if the first 7 terms of the geometric series