... round. The mathematics of the circle, then, is used to describe the wheel. The normal distribution has the following properties: 1. It is bell-shaped. 2. The mean, median, and mode are at the center ... Draw the normal distribution and place the mean, 24, at the center. Then place the mean plus one standard deviation (26) to the right, the mean plus two standard deviations (28) to the right, the ... is called the range. The range is the difference between the largest data value and the smallest data value. EXAMPLE: Find the range for 27, 32, 18, 16, 19, and 40. CHAPTER 9 The Normal Distribution...