Задача N5412 теория вероятностей доверительный интервал

5412. x̅=18.51, n=100, σ=7. Given the standard deviation σ=7 of a normally distributed random variable X, sample mean x̅=18.51, sample size n=100. 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)