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The mean income of a group of observations is $500; the standard deviation is $50. a)...

The mean income of a group of observations is $500; the standard deviation is $50.

a) Assuming a sample, according to Chebyshev’s theorem, at least what percent of the incomes will lie between $400 and $600 dollars (hint. +/- two standard deviations)?

b) Assuming a population with normal distribution, what percent of the incomes will lie between $400 and $600 dollars?

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