Need on number 8 for closer look click the picture thx!

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).

Choose the more precise measurement. 26.4 cm or 8.39 cm

Fill in the table with whole numbers to make 430 in five different ways