PreAlgebra
posted by Janessa .
Find the mean of the following data set:
25, 30, 20, 20, 25, 35, 35, 10
a. 15
b. 20
c. 25
d. 30
My Answer:
b. 20

http://www.mathsisfun.com/mean.html
Did you add them up and divide by 8? 
YES SO THE ANSWER IS 30

25 + 25 = 50
35 + 35 = 70
30 + 20 + 20 + 10 = 80
50 + 70 + 80 = ??
Divide that number by 8.