Suppose that the lengths of time individualsspend studying for the firstexamfollows a normal distribution with a mean of 300 hours and a standard deviation of 22.5 hours. What is the probability that...

Suppose that the lengths of time individualsspend studying for the firstexamfollows a normal distribution with a mean of 300 hours and a standard deviation of 22.5 hours.

1. What is the probability that a randomly selected individualtaking the first exam had studied more than 310 hours?


2. What is the probability that the mean amount of time studied by a sample group of 9 individualswill be more than 310 hours?


3. What is the probability that the mean amount of time studied by a sample group of 36 individualswill be more than 310 hours?