the average middle-distance runner at a local high school run the mile in 4.5 minutes, with a standard deviation of 0.3 minute. find the percentage of a runners that will run the mile in less than 4 minutes?
4 is .5 less than the mean of 4.5 To get the z score for this, just do .5 / .3 The z score will be negative, since you're considering something less than the mean. [ [ Look up a z score chart and figure out the percentage of the data that will be less than that z score. ]
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Asked 9/19/2012 11:35:12 AM
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