the average height of 30 girls out of a class of 40 is 160 cms and that of the

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Question

the average height of 30 girls out of a class of 40 is 160 cms and that of the remaining girls is 156 cms. the average height of the whole class is ?

Options:

A . 160 cms

B . 159 cms

C . 158 cms

D . 157 cms

Answer: Option B
Explanation :

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