Задача N5539 теория вероятностей доверительный интервал

5539. x̅=25.12, n=100, σ=5. The standard deviation σ=5 of a normally distributed random variable X, the sample mean x̅v=25.12, and the sample size n=100 are given. Find the confidence interval for estimating the unknown mathematical expectation a with a given confidence probability γ=0.95.

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