Beth is given the following question this is beths answer to the question why is beths answer incorrect

Which graph corresponds to the function f(x) = x2 + 4x – 1?

Find the value of x that will make l ll m

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%