Question

Find the mean of prime number which are less than 20.​

Answer 1

Answer:

Prime numbers less than 20 are 2,3,5,7,11,13,17,19

mean =sum of all observation / number of observation

mean =2+3+5+7+11+13+17+19/8

mean =77/8

Answer 2

The mean of prime number which are less than 20 is 9.625

Given :

The prime number which are less than 20

To find :

The mean of prime number which are less than 20

Solution :

Step 1 of 2 :

Write down sum of observations

Here we are given prime number which are less than 20

The prime numbers less than 20 are 2 , 3 , 5 , 7 , 11 , 13 , 17 , 19

Number of observations = 8

Sum of the observations

= 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19

= 77

Step 2 of 2 :

Find the mean

The required mean

= The mean of prime number which are less than 20

$\displaystyle \sf{ = \frac{Sum \: of \: the \: observations}{Number \: of \: observations} }$

$\displaystyle \sf{ = \frac{77}{8} }$

$\displaystyle \sf{ = 9.625}$

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