Question

Mean of 9 numbers is 10. If one more number is added, the mean remains as 10. Find the number which is added.

Answer 1

Answer:

10

Step-by-step explanation:

the number added is 10

Answer 2

Answer:

10

Step-by-step explanation:

If the average/ mean is added to data the mean will remain same.

MATHEMATICAL CALCULATION

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x= sum of all observation÷total observation

10=sum÷9

sum=90

Now additional observation is added but mean is same

10= new sum÷9+1

10=new sum÷10

new sum =100

To get the observation we have to subtract new sum of observation from the old one

100-90=10

WE CAN DIRECTLY GET IT AS ADDING MEAN TO OBSERVATION WILL NOT AFFECT MEAN

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