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 '.
