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Question

The following table gives the number of children of 150 families in a village.
No. of children (x)012345
No. of families (f)10215542157
Find the average number of children per family.

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Solution

Average (mean) =xififi

average fat number of children per family=(0×10)+(1×21)+(2×55)+(3×42)+(4×15)+(5×7)150

average fat number of children per family =0+21+110+126+60+35150

=352150=2.35

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