The random variable X is the crew size of a randomly selected shuttle mission. Its probability distribution is shown below. Complete parts a through c. x 2 3 4 5 6 7 8 P(X=x) 0.037 0.017 0.079 0.336 0.068 0.399 0.064 a. Find and interpret the mean of the random variable. μ= (Round to three decimal places as needed.)