ICSE Class X Math 2017 Paper

Question : 21 of 31

Marks: +1, -0

Calculate the mean of the following distribution using step deviation method.

Marks	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$
Number of Students	10	9	25	30	16	10

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