Help me out here please i need an answer with explanation 50 POINTS

Which of the following best describes the delian 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.

If np3 /nc2 = 6, find the value of n