A teacher gave a quiz worth 5 points. Find the following quiz average for a class of 20: Four students earned a 5.

Seven students earned a 4.

Six students earned a 3.

Two students earned a 2.

One student earned a 0.

Round to the tenths place if necessary.

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.