Задача N5440 теория вероятностей доверительный интервал

5440. x̅=13, n=20, σ=7. Find the confidence interval for estimating with reliability γ=0.97 the unknown mathematical expectation a of a normally distributed feature X of the general population, if the general standard deviation σ=7, the sample mean x̅v=13 and the sample size n=20.

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