Question

The class mark of a distribution are 6,10,14,18,22,26,30. Find class size and class interval

Answer 1

Answer:

Class intervals are 4-8, 8-12 and so on

Class size = UL - LL

= 8-4

= 4

Answer 2

Given : The class marks of a frequency distribution are 6, 10, 14, 18, 22, 26, 30

To Find :  class size and

the first class interval.

Solution:

class marks of a frequency distribution are 6, 10, 14, 18, 22, 26, 30

Difference between class marks is 4

Hence class size = class width = 4

Class Interval  is

Class Mark  -Class width/2   to Class Mark + Class width/2

first class mark = 6

Class width = 4

6 - 4/2   to  6 + 4/2

= 6 - 2  to 6 + 2

= 4 to 8

Hence first class interval  is  4 - 8

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