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 85 minutes is equal to the area under the standard normal curve between ___ and ___ . d) The percentage of finishers with times exceeding 71 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 85 minutes is equal to the area under the standard normal curve between ___ and ___ .
d) The percentage of finishers with times exceeding 71 minutes is equal to the area under the standard normal curve that lies to the _____ of ____ .
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