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6. In a certain distribution of numbers, the mean is 50 and the standard deviation is 5. At least what fraction of the numbers are

6. In a certain distribution of numbers, the mean is 50 and the standard deviation is 5. At least what fraction of the numbers are between the following pairs of numbers? ( Use Chebyshev's theorem) a) 40 and 60 b) 35 and 65

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