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Editorial: For the past two years, our dty has used photo radar to enforce speed limits at several Intersections, automatically photographing cars, measuring their speeds, and mailing tickets to offending drivers. In the second year of the program, the annual number of violations observed by photo radar dropped by 5 percent. This shows that the program has been effective at reducing speeding on the monitored streets.

The editorial's reasoning is most vulnerable to criticism on which of the following grounds?

Last month Ann, Bob, Carl, Dave, and Ellen volunteered at a hospital. The number of hours that Carl volunteered was equal to the average (arithmetic mean) number of hours volunteered by the 5 people. If the number of hours that Carl volunteered was also equal to the total number of hours that Ann and Bob volunteered, then the total number of hours that Dave and Ellen volunteered was how many times the number of hours that Carl volunteered?

For any data set, the proportion of data that lies within A" standard deviations of its mean is at least 1 - -K. The scores on a spelling test taken by 64 students have a mean of 74.0 and a standard deviation of 6.0. If t\$ the number of students who have scores greater than 62 and less than 86, and t\s as small as possible, what is the value of t?