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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).

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

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