5556. x̅=20.12, n=25, σ=3. Given the standard deviation σ=3, the sample mean x̅в=20.12 and the sample size n=25 of a normally distributed feature. Find the confidence interval for estimating the mathematical expectation a with a given reliability γ=0.99.

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