The spinner shown is divided into four equal sections 1 3 5 7 jim spins the arrow on the spinner. what is the probability that the arrow will land on 8

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).

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Ineed me i stuck and i don’t want to get it wrong