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Find the arithmetic mean of the children's height using direct method.

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9.394

9.925

7.925

6.925

answer is A.

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Detailed Solution

Given data,

Then,

Arithmetic mean using direct method formula is

\underset{̲}{x} = \frac{\sum f_{i} x_{i}}{\sum f_{i}}

\Rightarrow \underset{̲}{x} = \frac{1785}{190}

\Rightarrow \underset{̲}{x} = 9.3947

The average mean height of the children is

9.39

cm.
Hence, the correct option is 1.

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