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Quiz 4. John's answering machine receives about 7 telephone calls between 8 a.m. and 10 a.m....

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4. John's answering machine receives about 7 telephone calls between 8 a.m. and 10 a.m. What is the probability that John receives exactly one phone call between 9:00 am and 9:15 am?

5. Bus waiting time is uniformly distributed with the shortest and the longest waiting times being 9 and 21 minutes respectively. What is the standard deviation of the average waiting time of 46 passenger

6. The amount of time spouses shop for anniversary cards can be modeled by an exponential distribution with the average amount of time equal to 42 minutes. What is the probability that a randomly selected spouse spends 11 to 110 minutes to shop for anniversary card?

7. The amount of time spouses shop for anniversary cards can be modeled by an exponential distribution with the average amount of time equal to 44 minutes. Let X - is the amount of time (in minutes) that a randomly selected spouse spends to shop for anniversary card. What is the standard deviation of X?

8. You play a game of chance which you can either win or lose (there are no other possibilities). Probability of winning is 0.22. On average, how many games we have to expect until we get the first win?

9.The amount of time, in minutes, that a person must wait for a bus is uniformly distributed between 35 and 51 minutes. What is standard deviation of waiting time?

Math   Statistics-And-Probability   
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