What does she need to score on the fifth teat to get exactly a mean of 90?

I think I can bravely ignore the Freudian slip and solve this one.
-- If the mean of 5 tests is 90, then all 5 scores add up to (5 x 90) = 450
-- The sum of her first 4 scores is (95+ 90 + 85 + 95) = 365
-- If she has one more test to average 90, then she needs to score (450 - 365) = 85 on it.
That looks like choice 'G '.

Answered by AL2006 | 2024-06-10

The student needs to score 85 on the fifth test to achieve a mean of 90. This is determined by calculating the total score needed and subtracting the sum of the first four tests. Following the calculation, the required score is 85.
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Answered by AL2006 | 2024-12-24