Pls solve this it is math no scams ty

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).

If 20% of a number is 35, what is 50% of that number?

If you could answer these your a life saver