A telephone pollster has names and telephone numbers for 45 voters, 20 of whom are registered Democrats

Question:

A telephone pollster has names and telephone numbers for 45 voters, 20 of whom are registered Democrats and 25 of whom are registered Republicans. Calls are made in random order. Suppose you want to find the probability that the first two calls are to Republicans.
a. Are these independent or dependent events? Explain.
b. If you treat them as dependent events, what is the probability that the first two calls are to Republicans?
c. If you treat them as independent events, what is the probability that the first two calls are to Republicans?
d. Compare the results of parts b and c.
Probability and Court Decisions. The data in the following table show the outcomes of guilty and not-guilty pleas in 1,028 criminal court cases. Use the data to answer Exercises 15-20.