Write the fraction as a sum of unit fractions 6/6

Classify the following triangle check all that apply

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).

When only separate discreet points are graphed it is called?