A book seller recorded the sale of books for 50 days and the data is shown below. Find the median of the following data using relevant formulae:
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class interval frequency x C.F.
0-20 6 10 6
20-40 8 30 18
40-60 10 50 40
60-80 12 70 62
80-100 6 90 76
100-120 5 110 95
120-140 3 130 113
total: 50
median: L+ (n/2 - C.F.)/f x h
= 60+ (50/2- 62)/ 50 x 20
= 60+(25-62)/50 x 20
= 60+(-37)/50 x 20
= (3000-37)/50 x 20
= (2963/50) x 20
=5926/50
= 118.52
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