Question

calculating totals to find the mean
number of tests | score earned | total score
2 | 70 |
1 | 80 |
2 | 90 |
totals | |
sasha wants to know her average grade on her math tests. she earned a score of 70 on two tests, an 80 on one test, and a 90 on two tests. what is sasha’s mean score?
○ 70
○ 75
○ 80
○ 90

Explanation:

Step1: Calculate total score

$$2\times70 + 1\times80+2\times90=140 + 80+180=400$$

Step2: Calculate total number of tests

$$2 + 1+2=5$$

Step3: Calculate mean score

$$\frac{400}{5}=80$$

Answer:

80