Help, please don't answer if you don't know what I'm talking about. Is the equation equal to 18? Please explain how this works.
And no, it is not around 12.

Which of the following tables represents exponential functions?

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%

Ineed me i stuck and i don’t want to get it wrong