You intend to estimate a population mean μ with the following sample. 66.6
36.2
62.5
77.7
50.6
42
89.3
50.2
78
36.5
58.5
85.6
You believe the population is normally distributed. Find the 95% confidence interval.

What is the least common multiple of 6 and 17?

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

Which of the following parabolas opens down?