Задача N5526 теория вероятностей доверительный интервал

5526. x̅=38.12, n=81, σ=3. Find the confidence intervals for estimating the expectation a of a normal distribution with a reliability of 0.95 if the sample mean x̅=38.12, the sample size n=81, and the standard deviation σ=3 are known.

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