Given, Numbers of observations are given.

To Find: Calculate the Mean Deviation

Formula Used: Mean Deviation =

Explanation. Here, The Given class interval does not continue, So, we subtract 0.5 from a lower limit of the class and add 0.5 to the upper limit of the class,By this Class interval remain same while the function becomes continues.

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

N = 100

Thus, the cumulative frequency slightly greater than 50 is 63 and lie under class 35.5-40.5.

Median =

Median = 38

Mean Deviation =

Mean deviation for given data

Hence, The Mean Deviation is 73.5