In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Brad has sc

Question

3 years ago

5

In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Brad has sc

ored 82, 94, and 92 on the first three. What range of scores on the fourth test will give Brad a B for the semester (an average between 80 and 89, inclusive)? Assume that all test scores have a non-negative value.
Express your answer in interval notation.

Mathematics

1 answer:

AfilCa [17] · Answer 1 · 2022-12-28T06:02:37+03:00

AfilCa [17]3 years ago

3 0

Answer:

70 ≤ (94 + 89 + 78 + s)/4 ≤ 79

280 ≤ 261 + s ≤ 316

19 ≤ s ≤ 55

Step-by-step explanation: