Question

What happens to the mean of the data set {2 4 5 6 8 2 5 6} if the number 7 is added to the data set?

a) the mean decreases by 1

b) the mean increases by 2

c) the mean increases by 0.25

d) the mean increases by 0.75

Answer 1

c is the correct answer

Answer 2

C

Explanation:

before mean = 4.75

after adding 7 the mean = 5