5386. x̅=84.21, n=225, σ=15. Find confidence intervals for estimating the mathematical expectation a of a normal distribution with a reliability of 0.95, knowing the sample mean x̅=84.21, the sample size (number of observations) n=225, and the standard deviation σ=15.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
No feedback yet