What is the arithmetic mean of first five prime numbers ?

6.2

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5.2

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6.5

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5.6

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Solution

The correct option is D 5.6
The first five prime numbers are 2, 3, 5, 7 and 11.
$\Rightarrow$ Mean of the first five prime numbers
= $\frac{S u m o f a l l o b s e r v a t i o n s}{T o t a l n u m b e r o f o b s e r v a t i o n s}$
= $\frac{2 + 3 + 5 + 7 + 11}{5}$
= 5.6
$∴$ The required mean is 5.6.

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