Identify the gas particle that travels the fastest

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).

I’m which figure is point g an orthocenter

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.