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12. In 1987, Canadian Ben Johnson set a world record in the 100-m sprint. (The record was later taken away when he was found to have used an anabolic steroid to enhance his performance.) His speed at various times in the race is given in the following table: Time (sec) Speed (mph) 0 0 1.84 12.9 3.80 23.8 6.38 26.3 7.23 26.3 8.96 26.0 9.83 25.7 (a) Use the information in the table and the left endpoints to estimate the distance that Johnson ran in miles. You will first need to calculate At for each interval. At the end, you will need to divide by 3600 (the number of seconds in an hour) since the speed is given in miles per hour but the time is given in seconds. (b) Repeat part (a) using right end points. (c) Wait a minute, we know that the distance Johnson ran is 100 m. Divide this by 1609, the number of meters in a mile to find how far Johnson ran in miles. Is your answer from part (a) or part (b) closer to the true answer? Briefly explain why you think this answer should be more accurate