Use the following histogram to determine the number of scores that are less than 72.

14
6
16
12

Please, find attached the missing figure with the histogram.

Explanation:

The scores are represented by intervals in the horizontal axis.

The scores that are less than 72 are represented by the bars to the left of the bar with scores [72 - 73].

Those are the bars in the intervals [66-67], [68-69], and [70-71].

The number of scores for each interval of score are equal to the height of the correspondent bar in the histogram and you can read them in the vertical axis.

score Interval        number of scores

  [66-67]                              4

  [68-69]                              2

  [70-71]                               6

Hence, the total number of scores less than 72 is 4 + 2 + 6 = 12.

the answer is:

mean: 6

mad: 2.14