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andrew-mc [135]
2 years ago
13

marissa has taken four 100- point tests in math this semester. Her mean score is 89%. what score does she need on test 5 so the

mean will be 90%
Mathematics
2 answers:
aleksley [76]2 years ago
8 0
I mean, the mean could be 4 89s, so having a 94 on the test will boost her grade to a 90, as the mean is now higher with the fifth value.
alexgriva [62]2 years ago
3 0
Her total score for the 4 tests is 4*89 =   356

so to get a mean of 90%  she has to get  5*90 = 450 marks total
So in test 5 she needs to get 450 - 356 =  94 marks


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