Find the change in the average value

Question

after removing 99 from the following list of numbers: 45, 60, 89, 115, 120, 99, 103, 130, 5, 101, 69, 75, 98, 107.

Answer 1

Hello Sheily,

 

Average is the sum of the items divided by the the number of items, or:

Σx/n

 

The average of the original set is 1216/14 ≈ 85.86

After removing 99, the average of the remaining 13 items is 1117/13 ≈ 85.92.

 

The value of the average change by 85.92-85.86=.06