Задача N5393 теория вероятностей доверительный интервал

5393. x̅=84.28, n=64, σ=8. Find confidence intervals for estimating the mathematical expectation a of a normal distribution with a reliability of 0.95, knowing the sample mean x̅=84.28, the sample size (number of observations) n=64, and the standard deviation σ=8.

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