The finished solution. Reshebnik Arutyunov. Quest # 552.
551-560. Known expectation and a standard deviation σ of a normally distributed random variable X. Find the probability of getting this value in a given interval (α; β)
552. a = 9, σ = 5, α = 5, β = 14
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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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