QUESTION 27 A certain famous Canadian tennis player makes a successful first serve 69% of the time. Assume that each serve is independent of the others. If she serves 4 times, what is the probability that not all of these first serves are in? O 0.9908 0.7733 0.2267 0.0092 QUESTION 28 A large collection of accounting errors follow a normal distribution with a mean of O, and a standard deviation of 1. The IQR for this data is: O 1.349 2.314 2.134 O 1.943 QUESTION 29 In a class on probability, a statistics professor flips two balanced coins. Both fall to the floor and roll under his desk. A student in the first row informs the professor that he can see only one coin and it shows "tails". What is the probability that the other coin also shows "tails"? O 1/2 2/3 1/3 O 1/4