Problem N5719 probability theory sample size

Problem N5719 probability theory sample size

5719. σ=3, δ=0.4, γ=0.82. Find the minimum sample size at which, with a reliability of γ=0.82, the accuracy of estimating the mathematical expectation of the population based on the sample mean will be δ=0.4, if it is known that the standard deviation of the normal population is σ=3.

Additional information:

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