Question: Opinion polling organizations contact their respondents by telephone. Random telephone numbers are generated, and interviewers try to contact those households. In the 1990s this method could reach about 69% of U.S. households. According to the Pew Research Center for the People and the Press, by 2003 the contact rate had risen to 76%. We can reasonably assume each household's response to be independent of the others. What's the probability that
a) the interviewer successfully contacts the next household on her list?
b) the interviewer successfully contacts both of the next two households on her list?
c) the interviewer's first successful contact is the third household on the list?
d) the interviewer makes at least one successful contact among the next five households on the list?