help me please and when you guys send me the link for the answers it doesn't work and if u find the answers please write it down on a paper and upload it to me thank u and show your work guys. :)

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).