7.A city department of transportation studied traffic congestion on a certain highway: To encourage carpooling, the department will recommend a carpool lane if the average number of people in passenger cars on the highway i5 less than 2. The probability distribution of the number of people in passenger cars on the highway is shown in the table: Number ol people Probability 0.56 0.28 lo.o8 10.06 0.02 Let} = 'The number of people in passenger cars in the highway". Let Y the transformation of X by the rule Y = 75X + 5.Based on the new probability distribution, wtat is theimen number of people in passengers cars on the highway? (4)7.04 (B) 6 56 I(C) 4.7 (D) 12.10 (E) 6128