Задача N5604 теория вероятностей доверительный интервал

5604. x̅=27.7, n=75, σ=3.5. Find the confidence interval for the mathematical expectation a of a normally distributed quantitative attribute X of the general population with reliability γ=0.95, knowing the sample mean x̅в=27.7; sample size n=75 and standard deviation σ=3.5.

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