Question

The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate.

Literacy rate (in %):	45−55	55−65	65−75	75−85	85−95
Number of cities:	3	10	11	8	3

Answer 1

Let the assumed mean A = 70 and h = 10.

We know that mean,

Now, we have

Putting the values in the above formula, we have

Hence, the mean literacy rate is approximately 69.43%.