Задача N5411 теория вероятностей доверительный интервал

5411. x̅=18.41, n=36, σ=8. The standard deviation σ=8 of a normally distributed random variable X, sample mean x̅=18.41, sample size n=36 are given. Find confidence intervals for estimating the unknown mathematical expectation a with a given reliability γ=0.95.

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