Data range from 18 to 72. Using 6 classes, the class width is approximately:

The left edge of the box in a boxplot represents:

The lower fence is calculated as:

Find the mean from the frequency distribution:xf142254

The bars of a histogram:

A researcher surveys students sitting in the cafeteria.

Jersey numbers are measured at the:

Several classrooms are randomly selected and all students in those classrooms are surveyed.

Find the mean: 11, 15, 19, 23, 27

For a normal distribution, 95% of observations lie within: