What is the variance of the data set? 9, 7, 6.5, 7.5, 7, 8, 5, 6, 7.5, 8

Write a real-world solution that can be represented by the equation y = 7x be sure to explain what the variables represented in the solution

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).

Nick and nora are married and have three children in college. they have an adjusted gross income of 47,400. if their standard deduction is 12,600 itemized deductions are 14,200 and they get an exemption of 4000 for each adult and each dependent what is their taxable income