Given any two events, E1 and E2, what does the probability P(E1 ∪ E2) represent? A.
One of the events occurs, or both occur.

B.
Both of the events occur.

C.
Neither event occurs.

D.
One of the events occurs but not both.

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%