Задача N5421 теория вероятностей доверительный интервал

5421. x̅=75.09, n=196, σ=14. Find the confidence interval for estimating the mathematical expectation a of a normal distribution with a reliability of 0.95, knowing the sample mean x̅=75.09, the sample size n=196, and the standard deviation σ=14.

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