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17.. If X is N(u,02) and if Y =a + bX, then mean and variance of Y are respectively: * (1.5 Points) O atu and bo O at bu and o2 O at bu and bo 2 O p and o2 18. A random experiment contains: * (1 Point) At least one outcome At least two outcomes At most If one outcome O (d) At most two outcomes19. The coefficient of skewness of a normal distribution is: * (1.5 Points) Negative Zero Positive O Three 20. If Var(X) = 5 and Var(Y) = 10, then Var(2X + Y) is: * (1.5 Points) O 20 O 10 30 O