Susie scored 85, 84,and 78 on three of the four math tests. if her average score for the four tests was 86. what was her score o

Question

slega [8]

3 years ago

9

Susie scored 85, 84,and 78 on three of the four math tests. if her average score for the four tests was 86. what was her score o

n the fourth test?

Mathematics

2 answers:

nata0808 [166] · Answer 1 · 2022-05-02T16:10:57+03:00

nata0808 [166]3 years ago

7 0

(85 + 84 + 78 + x) / 4 = 86
(247 + x) / 4 = 86
247 + x = 86 * 4
247 + x = 344
x = 344 - 247
x = 97 <=== her score was 97

Karolina [17] · Answer 2 · 2022-05-02T17:41:20+03:00

Susie's average score was 86 so if you take 86 x 4 it would equal 344 which is her total points scored on the four tests. Take the total 344 - 85 = 259; then 259 - 84 = 175; then 175 - 78 = 97. The 97 is Susie's fourth test score because when you combine the four individual test scores you get 344. Take 344 and divide it by 4 and you will 86 which was her average score. Fourth test is 97.