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

## Solution :

Let the assumed mean, A = 70 and class size, h = 10

So, $$u_i$$ = $$x_i – 70\over 10$$

Mean = A + h $$\times$$ $$\sum f_iu_i\over \sum f_i$$

= 70 + 10 $$\times$$ $$-2\over 35$$ = 70 – 0.57 = 69.43%

Thus, mean literacy rate is 69.43%