the class mark of a frequency distribution are 10 12 14 16 the class corresponding to the class marks 14 is
Answers
Class marks are: 15,20,25,
Lower limit of class 20 is mean of 15 and 20=
2
15+20
=17.5
Upper limit of class 20 is the mean of 20 and 25=
2
20+25
=22.5
20 is the class mark for the class interval 17.5−22.5
Given : Class mark of a frequency distribution are 10 12 14 16
To Find : class corresponding to the class marks 14
Solution:
Class mark of a frequency distribution are 10 12 14 16
There is a gap of 2 between 2 consecutive class marks
Hence class width = 2
Class interval Class Mark - (class width)/2 to Class Mark + (class width)/2
Class interval for class mark 14
14 -(2/2) to 14 + (2/2)
= 13 to 15
Class Marks Class interval
10 9 - 11
12 11 - 13
14 13 - 15
16 15 - 17
Hence class corresponding to the class marks 14 is 13 - 15
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