Question

Heresa earned scores of 88 points, 84 points, 88 points, and 91 points on four tests. What is the lowest score she can get on the fifth test and still finish with an average score of 90 points?

96 points
97 points
98 points
99 points

Answer 1

99 points

Explanation:

total of scores of 4 tests = 88 + 84 + 88 + 91 = 351

5 tests with an average score of 90:

⇒ total of scores = 5 × 90 = 450

Lowest score of 5th test = 450 - 351 = 99 points

Answer 2

99 points

points scored:

88 points , 84 points, 88 points , 91 points, let the fifth test points be "n"

• given score with an average 90 points

`\sf \rightarrow (88 +84+88+91+n)/(5) =90`

`\sf \rightarrow 351+n =90 (5)`

`\sf \rightarrow n =450-351`

`\rightarrow \sf n = 99`