Statistics and Sampling Methods: Application and Analysis

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Statistics and Sampling Methods: Application and Analysis Q U E S T I O N 1 1. Car wash waiting times at the local convenience store follow a uniform distribution. The wait time ranges from 0 - 16 minutes. What is the mean waiting time at the car wash? a. 4 minutes b. 8 minutes c. 3 minutes d. 7 minutes 10 points Q U E S T I O N 2 1. The mean of a normal distribution of a set of truck tires is 300 pounds with a standard deviation of 10 pounds. What is the probability of a randomly selected set of tires weighing between 300 and 330 pounds? a. 0.1450 b. 0.4987 c. 0.4772 d. 0.3331 10 points Q U E S T I O N 3 1. A study of customer service phone calls indicates the calls average 20 minutes. The standard deviation equaled 5 minutes. Assuming that the distribution is normal, what percent of the calls took longer than 10 minutes to complete? a. 84.13% b. 34.13% c. 97.72%
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