Chapter 5 - Normal Probability Distributions - Section 5.1 Introduction to Normal Distributions and the Standard Normal Distribution - Exercises - Page 242: 13

The mean and the variance of the normal distribution are 18.5 and 2 respectively.

From our graph we can observe that in the symmetrical distribution the mean, median, and mode are equal. They are also located at the center of the graph and so the mean above the curve is 18.5. From the inflection points we see that the normal distribution is 2.