Question

the mean of 12 15 20 18 25 is

Answer 1

you use the formula for mean:
mean=sum of observation / no of observation
mean = 12+15+20+18+25/5............[the no of the observation are 5 so the no of observation is 5]
mean=90/5
mean= 18

Answer 2

The mean of 12 , 15 , 20 , 18 , 25 is 18

Given :

The observations 12 , 15 , 20 , 18 , 25

To find :

The mean

Solution :

Step 1 of 2 :

Calculate sum of the observations

Here the given observations are 12 , 15 , 20 , 18 , 25

Number of observations = 5

Sum of the observations

= 12 + 15 + 20 + 18 + 25

= 90

Step 2 of 2 :

Find the mean

The required mean

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

$\displaystyle \sf{ = \frac{90}{5} }$

$\displaystyle \sf{ = 18}$

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