Задача N5419 теория вероятностей доверительный интервал

5419. x̅=18.21, n=100, σ=3. Given the standard deviation σ=3 of a normally distributed random variable X, sample mean x̅=18.21, 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)