HINT 14J: The normal distribution follows exp(–*x*^{2}/2)/, where x is measured in standard deviations. Therefore, it has height 0.054, 0.242, 0.399, 0.242, 0.054 at *x* = –2, –1, ..., 2 standard deviations. These values can be used to make a rough sketch of the bell-shaped distribution.