Задача N5522 теория вероятностей доверительный интервал

5522. x̅=55, n=81, σ=8, Find the confidence interval for estimating the expectation of a normal distribution with a reliability of 0.95, knowing the sample mean x̅=55, sample size n=81, and standard deviation σ=8.

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