Find the mean of first five prime numbers.

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Solution

Step: Using the formula of mean

First five prime numbers $= 2, 3, 5, 7, 11$

Sum of all multiples $= 2 + 3 + 5 + 7 + 11 = 28$

$∴ M e a n = \frac{S u m o f a l l n u m b e r s}{N u m b e r o f o b s e r v a t i o n s}$

$∴ M e a n = \frac{28}{5}$

= 5.6
Hence, the mean of first five prime numbers is 5.6

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(v) First seven multiples of 5.

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(vii) All prime numbers between 50 and 80

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