Mathematics · Average

The arithmetic mean of the observations 21, 23, 38, 99, 64, 35, 48, 52 and 16 is:

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The average of 100 numbers is 40. If one of the numbers, 30, is replaced by 70 while keeping the other numbers same, what is the new average?

The arithmetic mean of 22.5, 56, 42.5, 2x + 1, x - 2, 3x, and 36 is 30. Find the value of x (where x > 0).

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