The following frequency table take shows the monthly consumption of 68 consumers of factory. Find
median of data.
Monthly consumption 65-85 85-105 105-125 125-145 145-165
No. of consumers 12 14 8 6 10
Answers
Given : monthly consumption of 50 consumers of factory
To Find : Mean
Median
Mode
Solution:
Monthly Mean
consumption consumption f d=(Mean - 115)/20 d*f
65-85 75 12 -2 -24
85-105 95 14 -1 -14
105-125 115 8 0 0
125-145 135 6 1 6
145-165 155 10 2 20
50 -12
Mean = 115 + 20 x (-12)/50
= 115 - 4.8
= 110.2
Monthly
consumption f cf
65-85 12 12
85-105 14 26
105-125 8 34
125-145 6 60
145-165 10 50
Median = 85 + 20 x ( 25 - 12)/14
= 85 + 18.57
= 103.57
Mode = 85 + 20 x ( 14 - 12)/(14 - 12 + 14 - 8)
= 85 + 5
= 90
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