Задача N5427 теория вероятностей доверительный интервал

5427. x̅=75.15, n=64, σ=8. Find the confidence interval for estimating the mathematical expectation a of a normal distribution with a reliability of 0.95, knowing the sample mean x̅=75.15, the sample size n=64, and the standard deviation σ=8.

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