Question

Kevin will take 4 math tests this term. All of the tests are worth the same number of points. After taking the first 3 tests, his mean test score is 88 points. How many points does he need on his last test to raise his mean test score to 90 points?

Choose the sentence that describes how the quantities in the problem are related.
CHECK

The mean score is the total of all scores minus the number of tests taken.


The total of the scores multiplied by the number of tests taken is the mean score.


The mean score is the total of all scores divided by the total number of tests.


The total of Kevin’s scores is the mean score divided by the number of tests taken.

Answer 1

Explanation:

Answer:

Let the test scores be x1, x2, x3, x4

(x1 + x2 + x3)/3 = 88

x1 + x2 + x3 = 264

(x1 + x2 + x3 + x4)/4 = 90

264 + x4 = 360

x4 = 360-264

x4 = 96

Therefore he should get 96 marks in his 4th test to raise his mean test score to 90

The mean score is the total of all scores divided by the total no. Of tests

Answer 2

Let the test scores be x1, x2, x3, x4

(x1 + x2 + x3)/3 = 88

x1 + x2 + x3 = 264

(x1 + x2 + x3 + x4)/4 = 90

264 + x4 = 360

x4 = 360-264

x4 = 96

Therefore he should get 96 marks in his 4th test to raise his mean test score to 90

The mean score is the total of all scores divided by the total no. Of tests

Hope this helps!