Find the mean of the following data:
$45, 35, 20, 30, 15, 25, 40$ .

15

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25

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35

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30

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Solution

The correct option is D $30$
Given data is: $45, 35, 20, 30, 15, 25, 40$ .

We know, Mean is given by,
$Mean = \frac{Sum of the elements}{Total number of elements}$ .

Here, number of observations $= 7$ .

$⟹ Mean = \frac{45 + 35 + 20 + 30 + 15 + 25 + 40}{7} = \frac{210}{7} = 30$ .

Therefore, option $D$ is correct.

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