the mean marks obtained by 30 students of a class is 46.If the mean of first 18 students is 50 then find the mean of last 12 students.
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the answer is 40
as you can do this by
first take out the sum of first 18 no.
that can be done by multiplying the mean and no. of observations that is 18 × 50= 900
then take out the mean of all no.
900+sum of 12 observations/30 = 46
that is sum if 12 observations =1380-900
12×mean of 12 observations=480
mean of 12 observations=40
as you can do this by
first take out the sum of first 18 no.
that can be done by multiplying the mean and no. of observations that is 18 × 50= 900
then take out the mean of all no.
900+sum of 12 observations/30 = 46
that is sum if 12 observations =1380-900
12×mean of 12 observations=480
mean of 12 observations=40
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