Write the expression seven less than n

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).

Solve the triangle. a = 21°, c = 105°, c = 5

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?