5414. x̅=18.71, n=25, σ=10. The standard deviation σ=10 of a normally distributed random variable X, sample mean x̅=18.71, sample size n=25 are given. Find confidence intervals for estimating the unknown mathematical expectation a with a given reliability γ=0.95.

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