In the diagram below of triangle ABC, D is a midpoint of AB and E is a midpoint of BC. If DE = 64 – 7x, and AC 48 4x, what is the measure of DE?

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).