Use 5 decimal places for intermediate calculations, and round your final answers to 3 decimal places. <<< X and Y are independent normal random variables with means μX =6 and μY=15 and standard deviations σX =3.7 and σY=6. Let W=20X−5Y−5. Find the following: (a) The mean of W : μW= (b) The standard deviation of W : σW = (c) P(20X−5Y>5)=