Problem N5710 probability theory sample size

Problem N5710 probability theory sample size

5710. σ=115, δ=24.3, γ=0.875 Find the minimum sample size at which, with reliability γ=0.875, the accuracy of estimating the mathematical expectation a of the general population by the sample mean is δ=24.3, if the standard deviation σ is known =115 normally distributed population.

Additional information:

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