Задача N5428 теория вероятностей доверительный интервал

5428. x̅=75.16, n=49, σ=7. 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=75.16, the sample size n=49, and the standard deviation σ=7.

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