Задача N5450 теория вероятностей доверительный интервал

5450. x̅=13.3, n=26, σ=1.4. Find the confidence interval for estimating with reliability γ=0.99 the unknown mathematical expectation a of a normally distributed feature X of the general population, if the general standard deviation σ=1.4, sample mean x̅=13.3, sample size n=26.

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