Show that x+y:x-y=3:2

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).

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9