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.
The probability density function of the normal distribution with mean and variance (equivalently, standard deviation) is an example of a Gaussian function, (See also exponential function and pi. ). If a random variable has this distribution, we write ~ .If and, the distribution is called the standard normal distribution and the probability density function reduces to. The image to the right gives the graph of the probability density function of the normal distribution various parameter values.ome notable qualities of the normal distribution: 1  The density function is symmetric about its mean value. 2  The mean is also its mode and median. 3  68.268949% of the area under the curve is within one standard deviation of the mean.