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leach My Notes Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 148 minutes with a standard deviation of 15 minutes. Consider 49 of the races. Let x = the average of the 49 races. a Part (a) Give the distribution of (Round your standard deviation to two decimal places.) Part (b) Find the probability that the runner will average between 146 and 149 minutes in these 49 marathons. (Round your answer to four decimal places.) Part (c) Find the 60th percentile for the average of these 49 marathons. (Round your answer to two decimal places.) min Part (d) Find the median of the average running times. min
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