Задача N5508 теория вероятностей доверительный интервал

5508. Find a confidence interval for estimating the mathematical expectation m of a normal law with a reliability of 0.8; knowing the sample mean x̅=12.78, n=50, σ=8, γ=0.8.

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