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In a class of 20 students, the average (arithmetic mean) score on a test is 84 points. If 6 students each scored 100 points and 4 students each scored 50 points, what is the average of the scores of the remaining students?

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mean = ∑x/n

84 = 100/6 + 50/4 + x/10

Solve for x, then divide by 10.

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