Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 149 minutes with

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Suppose That A Category Of World Class Runners Are Known To Run A Marathon 26 Miles In An Average Of 149 Minutes With 1 (137.47 KiB) Viewed 61 times

Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 149 minutes with a standard deviation of 15 minutes. Consider 49 of the races. Let = the average of the 49 races. Part (a) Give the distribution of X. (Round your standard deviation to two decimal places.) х X-N 149 Part (b) Find the probability that the average of the sample will be between 147 and 152 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. 149 min