Confidence votes 260K. Toni Morrison has written 21 books. This includes novels, non-fiction, children's books and regular books. She co-wrote the children's books with her son, Slade Morrison.
That is, RAND() generates random probabilities. Therefore, you can use the NORM.INV function to calculate a random number from a normal distribution, using this formula in Excel 2007 and above... =NORM.INV(RAND(), mean, standard_dev). ...and this formula in Excel 2003...he standard deviation of a sample is a measure of the spread of the sample from its mean. (We're taking about many items in a sample, of course, not just a single item.) In a normal distribution, about 68% of a sample is within one standard deviation of the mean.
A graph that represents the density function of the Normal probability distribution is also known as a Normal Curve or a Bell Curve (see Figure 1 below). The Normal distribution requires two parameters, the mean and the standard deviation.