Question

A set of data has 50 observations. How many classes would you recommend?​

Answer 1

• 6 classes

Explanation:

If k is the number of classes and n is the number of observations, then for number of classes we should select the smallest k such that 2^k > n.

We have n = 50 and:

• 2^5 = 32 < 50
• 2^6 = 64 > 50

As per above described 2 to k rule, we are taking k = 6.

So 6 classes should be used.