In the mean of the tabulated data, if the frequencies of n observations
x_{1}, x_{2}, x_{3}, ………. x_{n} are f_{1}, f_{2}, f_{3} ………. f_{n}, then
Workedout 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 
Variable (x_{i})  4  6  8  10  12  15 
Frequency (f_{i})  8  9  17  a  8  4 
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
● Statistics
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