In the mean of the tabulated data, if the frequencies of n observationsx1, x2, x3, ………. xn are f1, f2, f3 ………. fn, then
Worked-out examples on mean of the tabulated data:
1. Find the mean weight of 50 girls from the following table.
|Weight in kg||40||42||34||36||46|
|No. of girls||6||6||15||14||7|
But given mean = 9
So, we have (378 + 10a)/(46 + a) = 9
378 + 10a = 9(46 + a)
378 + 10a = 414 + 9a
10a - 9a = 414 - 378
a = 36
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