Question

The mean of five numbers is 6. if one of the numbers is removed, the mean becomes 7. what is the value of the number that was removed?

Answer 1

mean = sum/number

 so 6= sum/5  6 x 5 = sum. 6 x 5 = 30

7= 30-r/4

28=30-r

30-28 = r

r=2

 so the number 2 was removed