Задача N5383 теория вероятностей доверительный интервал

5383. x̅=21, n=493, σ=15. Find the confidence interval for estimating the mean of a normal distribution with a reliability of 0.990 given a sample mean of 21, a sample size of 493, and a standard deviation of 15.

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