Suppose a Normal Model Describes the Number of Pages Printer

Multiple Choice

Suppose a Normal model describes the number of pages printer ink cartridges last. If we keep track of printed pages for the 47 printers at a company's office, which must be true?
I. The page counts for those ink cartridges will be normally distributed. II. The histogram for those page counts will be symmetric.
III. 95% of those page counts will be within 2 standard deviations of the mean.

A) I, II, and III
B) I only
C) II only
D) none
E) II and III