A little league baseball team is ordering hats. The graph shows the relationship between the total cost, in dollars, and the number of hats ordered. What does the slope of the graph tell us in this situation?

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%