Question

Which of the following is always true of a normal distribution?

I. It extends exactly three standard deviation in each direction from the mean
II. The mean equals the median, which equals the mode.
III. An interval one standard deviation wide centered at the mean has more area under the curve than an interval one standard deviation wide centered at a value to the right of the mean

A. I only
B. II and III only
C. I and III only
D. II only
E. I, II, III