Crown gall causes stunting of growth. Both loss of yield and stunting of growth may occur when seedlings or young cuttings are infected in the early stages of plant growth. The lack of vigor, reduction in foliage, and water stress are associated with chronically diseased root systems.
1. In probability theory, a probability density function (pdf), or density of a continuous random variable, is a function that describes the relative likelihood for this random variable to take on a given value.
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.