Question

9) The mean of a group of 8 observations is 9. Two new observations 10 and 13 are added to the group. Find the new mean. (a) 7.5 (b) 8.5 (c) 9.5 (d) 10.5​

Answer 1

Answer:

9.5

Explanation

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