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 By assumed mean method.
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mean
=sum of number of observation÷total number of observations
=(17+28+32+24+19)÷5
=120÷5
=24
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