Question

For a certain data set Maximum observation is 56, minimum observation is 12 and 5 classes to
be constructed, then appropriate class interval is _______

Answer 1

The answer is nine.

Step-by-step explanation:

• The range of the given observation $= 56-12 = 44$
• Total values in the above range $= 44+1 = 45$
• The number of classes to be constructed $= 5$
• Hence, the class interval should be the range divided by the number of classes $=\frac{45}{5} = 9$

The desired class intervals would be

$12-20, 21-29, 30-38, 39-47, 48-56$ or

$12-21, 21-30, 30-39, 39-48, 48-56$

Thus, the appropriate class interval is nine.