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andrew-mc
[135]
3 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
Answer
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2
answers:
aleksley
[76]
3 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.
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alexgriva
[62]
3 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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