Some Statisticians Use a Guideline That Says That Events That

Multiple Choice

Some statisticians use a guideline that says that events that happen 5% of the time or less often should be considered "unusual." By this standard, is it unusual to have a car speed of 75 mi/hr or greater?

A) No, this would not be unusual because it is only 2 standard deviations higher than the mean.
B) No, this would not be unusual because is only 1 standard deviation higher than the mean.
C) Yes, this would be unusual because it is 3 standard deviations higher than the mean.
D) Yes, this would be unusual because it is 4 standard deviations higher than the mean.