(a) By Chebychev's Theorem, at least how many students in a class of 200 would score within...

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(a) By Chebychev's Theorem, at least how many students in a class of 200 would score within the range μ ± 2σ ?
(b) By the Empirical Rule, how many students in a class of 200 would score within the range μ ± 2σ ?

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