A set of 500 values is normally distributed with a mean of 24 and a standard deviation of 2.
a. What percent of the data is in the interval 22-26?
b. What percent of the data is in the interval 20.5-27.5?
c. Find the interval about the mean that includes 50% of the data.
d. Find the interval about the mean that includes 95% of the data.