A space agency compiles data on space shuttle launches and publishes them on its website The following table displays a frequency distribution for the number of crew members on each shuttle mission over a 30 year period Let X denote the crew size on a randomly selected shuttle from this time period Complete parts a through e below Crew size Frequency 3 4 5 7 6 31 7 24 a What are the possible values of the random variable X Use a comma to separate answers as needed 8 74 9 1 D ww