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  4. The arithmetic mean of the following data is 7 . Find (a+b). x f 4 a 6 4 7 b 9 5

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Q. The arithmetic mean of the following data is 7 . Find $(a+b)$.
x f
4 a
6 4
7 b
9 5

Statistics

Solution:

Use the arithmetic mean formulae for descreate series.