Question

If the sum of n observations is 630 and the mean is 42 then the value of n is

Answer 1

i think right answer is 12 .
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Answer 2

The value of n is 15.

Step-by-step explanation:

The formula to find the mean of the data is given by :

$Mean=\dfrac{Sum\ of \ all \ observations}{ Number\ of\ data\ values}$

Given : The sum of n observations is 630 and the mean is 42 .

Substitute all the given values in the formula , we get

$42=\dfrac{630}{n}$

$\Rightarrow\ 42n=630$   [Multiply n on both sides]

$\Rightarrow\ n=\dfrac{630}{42}=15$   [Divide both sides by 42]

Therefore , the value of n is 15.

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If the mean of26,19,15,24and x is x then find mean

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