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Suppose that a category of world class runers are known t run a marathon (26 miles)...

Suppose that a category of world class runers are known t run a marathon (26 miles) in an average of 144 minutes with standard deviation of 11 minutes. Consider 49 of the races.

Let x hat = average time of the 49 races

a. Find the median of the average running times ..... minutes

b. Find the slowest 10 % of the average running times (round to 2nd decimal place).... minutes

c. Find the fastest 10% of the average running times ( round to the 2nd decimal place) ... minutes

Math   Statistics-And-Probability   
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