1. A bank branch located in a residential area is concerned with the noon-to-1:00 p.m. Iunch hour. The waiting time, in minutes (defined as the time the customer enters the line to when he or she reaches the teller window), of a sample of 15 customers during this hour is recorded over a period of one week. The results are listed below: 9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 5.64 4.08 6.17 9.91 5.47 a. Compute the mean, median, and mode. b. As a customer walks into the branch office during the lunch hour, he asks the branch manager how long he can expect to wait. The branch manager replies, “Almost certainly less than five minutes." On the basis of the results in (a), evaluate the accuracy of this statement. 2. The mean score in statistics of 50 students in a class was 72 and that of the 35 boys was 75. Find the mean score of the girls in the class. 3. The mean of 200 items was found to be 50. Later on it was discovered that two items were wrongly read as 92 and 8 instead of the correct values 192 and 88 respectively. Find the correct mean.

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A: Given information: Number of contacts(x) Sales(y) 14 24 12 14 20 28 16 30 46 80 23 30…

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A: a) X f cf Proportion rcf fx 4 3 3 0.1875 19% 12 5 2 5 0.125 31% 10 6 4 9 0.25 56% 24 7 1…