The mean of four numbers a, b, c, d is 100. If c = 70, then the mean of the remaining numbers is
If the mean of a, b, c and d is 100, their sum is \(4 \times 100 = 400\). Removing c = 70 leaves 330 for the other three numbers, whose mean is \(\frac{330}{3} = 110\). 30…
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The mean of four numbers a, b, c, d is 100. If c = 70, then the mean of the remaining numbers is
Answer and explanation
Correct answer D
If the mean of a, b, c and d is 100, their sum is . Removing c = 70 leaves 330 for the other three numbers, whose mean is . 30 is merely the gap between the old mean and c, not the new mean.
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