Suppose that the number of hits on your company's website, from noon to 01:00 pm on a typical weekday, follows a normal distribution (approximately) with a mean of 190 and a standard deviation of 24.
a. Find the probability that the number of hits is more than 160.
b. Find the probability that the number of hits is less than 215.
c. Find the probability that the number of hits is between 165 and 195.
d. Find the probability that the number of hits is not between 150 and 225.