Question

Sam scored 59, 64, and 68 on three tests. How many points should he get on the fourth test to get an average score of 70?

63.67 points
65.25 points
75 points
89 points

Answer 1

what is the average of the first 3 tests?

Answer 2

x1+x2+x3+x4 all over number of tests = ave

Answer 3

59+64+68+x all over 4 = 70

that would be your equation

Answer 4

\[\frac{1}{4} (x+68+64+59)=70 \]
x = 89