7/12 to a decimal rounded to the nearest thousanth

Which statement best describes the polynomial

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).

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.