Acharity is selling raffle tickets at $5 apiece. out of the 100 tickets sold, ten third-place winners will be drawn, each winning $20. five second-place winners will be drawn, each winning $50. lastly, one grand prize of $100 will be awarded. is a raffle with these rules a good idea for the charity? why or why not?

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.