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Find the mean of the following data:

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21

19

25

31

answer is C.

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Detailed Solution

The given data is:
Question Image

We need to find its mean.
We can write the frequency distribution table for the given data as:
Question Image

We know that,

Mean = \frac{Σfx}{Σf}

\Rightarrow Mean = \frac{2650}{106}

\Rightarrow Mean = 25

Therefore, the mean of the given data is

25

.
Hence, the correct option is 3.

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