Question

The mean of 10 observation is 15.3 if two observation is 6 and 9 are replace by 8and 14 find new mean

Answer 1

first multiply 10 with 15.3 you get the sum of 10 observations and then add 2 and 5 for the substitution of 6 and 9 with 8 and 14
then divide the result with 10 you will get the answer of new mean