940 people opened a loot crate in a video game. 35 individuals opened up a rare weapon skin, 12 individuals opened up an ultra-rare weapon skin, and everyone else opened up a common weapon skin. What is the probability of finding a common weapon skin? Round your answer to the thousandths place.

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.