Opinion-polling organizations contact their respondents by sampling random telephone numbers. although interviewers can reach about 67% of households, the percentage of those contacted who agree to cooperate with the survey is only 39%. each household is independent of the others. a) what is the probability that the next house will be contacted and refuse to cooperate? b) what is the probability of failing to contact a house, or making contact and not getting them to agree to the interview? c) show the reasonable ways to calculate the probability in part b.