ions Section 7.2 nl / 5 | 113% 31 + | 18. Suppose that random variable X is defined to be the number of passengers (not including the driver) observed in cars and vans in a city's high occupancy vehicle lane. The frequency distribution for this random variable is given below. Find the expected value of this random variable. Number of Passengers Frequency 0 7 1 154 2 297 3 229 4 54 5 9 19. Suppose that random variable X is defined to be the number of items of clothing per order that customers leave with a dry cleaner for cleaning. The frequency W K 8 EJ Apr 6 1:59 4 4 X P