7. [0.6/1 Points] DETAILS H PREVIOUSANSWERS SCALCET9 15.4.031. Suppose X and Y are random variables with the given joint density function. My) ={o.1e-(-5X + My) ifx z o, y 2 u 0 otherwise (a) Is fa joint density function? Yes 0 No y (b) _i=ind P(Y > 3). (Round your answer to four decimal places.) :_x ' Enter a number. . - _ , Y s 7). (Round your answer to four decimal places.) (c) Find the expected value of X. y Find the expected value of v. Ev MV NOTES H ASKYOURTEACHER PRACTICE ANOTHER