As reported in "Runner's World" magazine, the times of the finishers in the New York City 10 km run are normally distributed with a mean of 61 minutes and a standard deviation of 9 minutes. Let x denote finishing time for the finishers. a) The distribution of the variable x has mean ____and standard deviation ___. b) The distribution of the standardized variable z has mean ___and standard deviation ____ c) The percentage of finishers with times between 40 and 75 minutes is equal to the area under the standard normal curve between ____ and ____ d) The percentage of finishers with times exceeding 80 minutes is equal to the area under the standard normal curve that lies to the ____ of _____
As reported in "Runner's World" magazine, the times of the finishers in the New York City 10 km run are
a) The distribution of the variable x has mean ____and standard deviation ___.
b) The distribution of the standardized variable z has mean ___and standard deviation ____
c) The percentage of finishers with times between 40 and 75 minutes is equal to the area under the standard normal curve between ____ and ____
d) The percentage of finishers with times exceeding 80 minutes is equal to the area under the standard normal curve that lies to the ____ of _____
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