D Question 9 30 pts Let X1 and X2 be independent random variables with common probability mass function px (0) = , px (1) = 2, Px (2) = Find the following values of the probability mass function and distribution function of X1 + X2. Hint: keep exactly 4 decimal places after the decimal point If you believe that some math formals are not properly displayed, please switch the browser, say Google Chrome. PXitX2 (1 ) = PXItX2 (2) = PXItX2 (3) = Fxitx, (1.3) =[f1.3] Fxitx2 (3) = Fxitx2 (2.8) =[f2.8]