Katherine recorded the weekly number of hours she worked at her summer job. If the
mean of the data is 20 with a standard
deviation of 5.7, circle all values that fall
within one standard deviation of the mean.
{9, 14, 18, 20, 23, 24, 25, 27}

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.