On the average, 6.7 cars arrive at the drive-up window of a bank every hour. Define the random variable x to be the number of cars arriving in any hour.
a. What is the appropriate probability distribution for x? Explain how x satisfies the properties of the distribution.
b. Compute the probability that exactly 5 cars will arrive in the next hour.
c. Compute the probability that no more than 5 cars will arrive in the next hour.
Question 2
The 95 confidence interval estimate of a population variance when a sample variance of 324 is obtained from a sample of 81 items is
a. 14.14 to 174.94.
b. 243.086 to 453.520.
c. 16.42 to 194.35.
d. 254.419 to 429.203.
At breakfast, a middle-class husband sits absorbed in the newspaper and the public affairs of the da
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