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4 votes
Please help on 13!!!

Please help on 13!!!-example-1
User MkUltra
by
8.0k points

2 Answers

3 votes

Answer:

100

Explanation:

Let the unknown score be x.

To find the average, you add all the scores and divide by the number of tests. Let's add all the scores including x:

89 + 95 + 76 + x = 260 + x = x + 260

All 4 scores, including the unknown one, add to x + 260.

To find the average, you divide the sum of the scores by the number of grades, which is 4 in this case.

The average is

(x + 260)/4

You want the average to be 90, so set the average equal to 90 and solve for x.

(x + 260)/4 = 90

Multiply both sides by 4.

x + 260 = 360

Subtract 260 from both sides.

x = 100

You must get a 100 on the next test.

(Start studying now!)

User Rafael Sousa
by
8.3k points
6 votes

I am pretty sure your test score has to be an 86.

User JamieL
by
8.2k points

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