Question

the mean of 5 numbers is 16 if one of the number is is excluded the mean becomes 12.5 find out the the excluded number​

Answer 1

The excluded number would be 30.

Explanation:

It has been given that the mean of 5 numbers is 16.

Hence, 16*5 = 80

On excluding an observation, the mean of the remaining 4 observations is 12.5

Hence, 12.5*4 = 50

Therefore the sum of the remaining 4 observations = total of 5 observations - the total of 4 observations

So, 80-50 = 30

 

Answer 2

Answer:

202.5

Step-by-step explanation:

Mean= sum of all digits/total no. of all digits

let the numbers be x.

x+x+x+x+x/5x=16/1

x+x+x+x+x×1=16×5x

5x=80x

x=80/5

so this means that the sum of these numbers is 80 (as 5 is the total no. of digits)

so, if we subtract one of the numbers then we get 12.5 as the mean.

therefore,

80-x/4x=12.5

-x/4x= 12.5-80

-1/3x= -67.5

x= -67.5×3/-1

x= 202.5

Thus the excluded no. is 202.5

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