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  3. FINISHING TIMES AND TRAINING INDICES FOR 50 BICYCLISTS IN A RACE A bicycle trainer studied 50 bicyclists to examine how the fi

FINISHING TIMES AND TRAINING INDICES FOR 50 BICYCLISTS IN A RACE A bicycle trainer studied 50 bicyclists to examine how the fi

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问题 FINISHING TIMES AND TRAINING INDICES
FOR 50 BICYCLISTS IN A RACE

A bicycle trainer studied 50 bicyclists to examine how the finishing time for a certain bicycle race was related to the amount of physical training in the three months before the race. To measure the amount of training, the trainer developed a training index, measured in "units" and based on the intensity of each bicyclists training. The data and the trend of the data, represented by a line, are displayed in the scatterplot above.
(a)How many of the 50 bicyclists had both a training index less than 50 units and a finishing time less than 4.5 hours?
(b)What percent of the 10 fastest bicyclists in the race had a training index less than 90 units?
选项
答案five 70 percent
解析 (a)The number of bicyclists who had both a training index less than 50 units and a finishing time less than 4.5 hours is equal to the number of points on the graph to the left of 50 and below 4.5. Since there are five data points that are both to the left of 50 units and below 4.5 hours, the correct answer is five.
(b)The 10 lowest data points represent the 10 fastest bicyclists. Of these 10 data points, 3 points are to the right of 90 units, so the number of points to the left of 90 units is 7, which represents 70 percent of the 10 fastest bicyclists.
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