Задача N5368 теория вероятностей доверительный интервал

5368. x̅=89, n=821, σ=23. Find the confidence interval for estimating the mean of a normal distribution with a reliability of 0.930 given a sample mean of 89, a sample size of 821, and a standard deviation of 23.

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