find the median
Class 1 - 19 21 - 39 41 - 59 61 - 79 81 - 99 101 - 119 121 - 139
Frequency 6 8 10 12 6 5 3
Answers
Given :
Class 1 - 19 21 - 39 41 - 59 61 - 79 81 - 99 101 - 119 121 - 139
Frequency 6 8 10 12 6 5 3
To Find : Median of Data
Solution:
Interval f cf
0 - 20 6 6
20 - 40 8 14
40 - 60 10 24
60 - 80 12 36
80 - 100 6 42
100 - 120 5 47
120 - 140 3 50
Total data = 50
50/2 = 25
25 lies in 60 - 80
Median = 60 + 20 x ( 25 - 24)/12
= 60 + 1.67
= 61.67
Median = 61.67
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