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Meera's marks in three tests are 8, 9, 9 (out of 10)

Meera's marks in three tests are 8, 9, 9 (out of 10). She finds the average: (8+9+9)/3 = 8.67. Then she says "that's wrong — none of my tests scored 8.67". Her brother says an average does not have to be one of the values in the list. Who is right?

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