The question, “how many ways can 4 students be chosen from a class of 30 students? ”, is a(n) combination permutation independent event mutually exclusive event

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%

Add the fractions and simplify 1/2+ 1/3

In an improper fraction, is the numerator equal to, less than, or greater than the denominator