# Question #e84c9

##### 1 Answer

Sep 15, 2015

There are no clear cut formulae, though. Take the range R = L - S.

Let k = No of groups. Then R = ck, where c = Class interval. Decide either c or k arbitrarily, based on the data at hand.

#### Explanation:

L = Largest value, S = Smallest value. K is normally chosen as a number between 5 and 10.