Question

what is the mean of 20 , 40 , 60 , 80 , 100 and 90 ?

Answer 1

mean=20+40+60+80++90+100/5

=29/5

=49 is the mean of all the numbers present.

Answer 2

The required mean = 65

Given :

The observations 20 , 40 , 60 , 80 , 100 , 90

To find :

The mean

Solution :

Step 1 of 2 :

Write down the given data

Here the given observations are 20 , 40 , 60 , 80 , 100 , 90

Number of observations = 6

Sum of the observations

= 20 + 40 + 60 + 80 + 100 + 90

= 390

Step 2 of 2 :

Find the mean

The required mean

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

$\displaystyle \sf{ = \frac{390}{15} }$

$\displaystyle \sf{ = 65}$

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