Given, Numbers of observations are given.

To Find: Calculate the Mean Deviation

Formula Used: Mean Deviation =

Explanation.

Here we have to calculate the mean deviation from the median. So,

We know, Median is the Middle term,

Therefore, Median = 61

Let x_i =Heights in inches

And, f_i = Number of students

N=197

Mean deviation=

Hence, The mean deviation is 1.70.