Need help with understanding these 2 geometric problems.

1. The most common data collection method in consumer and market research is the telephone survey. A major problem with consumer telephone surveys, however, is nonresponse. How likely are consumers to be at home to take the call and, if at home, how likely are they to take part in the survey? To answer these and other questions, R. A. Kerin and R. A. Peterson directed a study of over 250,000 random-digit dialings of both listed and unlisted telephone numbers across the United States (Journal of Advertising Research, Apr./May 1983). The probability of a completed interview was assessed to be 0.084. a) What is the probability that the first completed interview is obtained on the fifth call? b) What is the probability that the first completed interview occurs sometimes during the first five calls? c) Find the mean number of calls that must be made before the first completed interview is obtained? 2. According to Engineering News-Record (Dec. 1, 1983), the District of Columbia is now mandating that at least one-half of all the jobs created by city contracts be filled by local residents. Suppose you want to survey jobs created by city contracts after the mandate was issued to determine the level of compliance with the new law. If in fact only 40% of all jobs created by city contracts are filled by local residents: a) What is the expected number of jobs you would have to survey before you find one that has been filled by a local resident? b) What is the probability that the first job that is found to be filled by a local resident is the fourth person surveyed? c) What is the probability that the first job that is found to be filled by a local resident is among the first four people surveyed