I need help somone pls asap !!

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).

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?