So I took probability last year, and for one of my classes we have an optional refresher worksheet, but I cannot remember how to deal with random variables :( I don't need the answer -- just some guidance on what formulas to use please! x is a random variable with mean 5 and variance 12. y = 3 + 9x a) what is the expected valued of y? b) what is the variance and SD of y? c) is y normally distributed? thank you so much!!!