We would like to estimate the average time it takes to run a mile for all fourth graders in the US. We take a sample of 33 fourth graders from a school in Midfield, Kentucky and obtain a sample mean mile time of 9.2 minutes and a sample standard deviation of 4.7 minutes. A histogram of those 33 times looks like:

15- 10- count 5 - 0 - O - 10 15 20 25 times