find the mean of the following frequency distribution CLASS =0-20, 20-40, 40-60, 60-80, 80-100 FREQUENCY = 17, 28, 32, 24, 19 respectively
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x f fx
10 17 170
30 28 840
50 32 1600
70 24 1680
90 19 1710
120 6000
mean = sigma fx/ sigma f
= 6000/120
=50
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