Question

The mean of 8 observations is 9.Two new observations 10 and 13 are added to group.Find the mean of 10 observations.

Answer 1

Answer:

9.5

Step-by-step explanation:

the mean of 8 observations is 9 so so you can arrive at the sum of all 8 observations as 8*9=72.

This is because multiplying the mean with the total number of observations is equal to adding all the observations.

now, add 10 and 13 to 72 so that the new total sum is 95.

the total observations have become 10 now.

so the new mean is 95/10=9.5

Answer 2

Answer: 9.2

   mean is 9 and there are 8 observations so it should be 72/8. if we add 10 and 13 which will be 23 to 72 it would be 95 (observation is also increased)

92/10=9.2