Calculate the mean using step deviation method — task. Mathematics State Board, Class 9.

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Find the mean of the number of children of various age groups playing in the park using step deviation method.

Age	$2 - 4$	$4 - 6$	$6 - 8$	$8 - 10$	$10 - 12$
Number of children	8	7	7	3	4

The mean of the data is

$1$

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11. Calculate the mean using step deviation method