The school cafeteria offered a choice of pizza or nachos to sixth-graders students. Seventy-seven students chose pizza. This represented 35% of the sixth grade class. How many students are in the sixth grade

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.