In each of Exercises, the quantitative data set under consideration has roughly a bell-shaped distribution. Apply the empirical rule to solve each exercise. The data set has size 40. Approximately how...

In each of Exercises, the quantitative data set under consideration has roughly a bell-shaped distribution. Apply the empirical rule to solve each exercise.

The data set has size 40. Approximately how many observations lie within two standard deviations to either side of the mean?