Задача N5406 теория вероятностей доверительный интервал

5406. x̅=117.49, n=81, σ=9. Find confidence intervals for estimating the expectation a of a normal distribution with a reliability of 0.95, knowing the sample mean x̅=117.49, the sample size (number of observations) n=81, and the standard deviation σ=9.

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