(a) what is the probability that at most 4 of the calls involve a fax message?.

Find two rational expressions that have the difference of 2-n/n-4

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).

Can anyone me with 32,33,36,37,and 40.