5711. σ=9, δ=2, γ=0.901. Find the minimum sample size at which, with reliability γ=0.901, the accuracy of estimating the mathematical expectation a of the general population by the sample mean is δ=2, if the standard deviation σ=9 of a normally distributed general population is known

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)