Whenever a Statistical Population Can Be Described, at Least Roughly

Multiple Choice

Whenever a statistical population can be described, at least roughly, by the perfectly symmetrical, bell-shaped normal curve, we can estimate the percentages of all population values that lie within specified numbers of standard deviations from the mean with the help of:

A) Tchebysheff's Theorem
B) the empirical rule
C) the interquartile range
D) box plot
E) none of these