Using historical records, a manufacturing firm has developed the following probability distribution for the number of days required to get components from its suppliers. The distribution is shown here, where the random variable x is the number of days. P(x) 4 0.17 5 0.38 6 0.31 7 0.105 8 0.035 Using historical records, a manufacturing firm has developed the following probability distribution for the number of days required to get components from its suppliers. The distribution is shown here, where the random variable x is the number of days. X P(x) 4 0.17 5 0.38 6 0.31 7 0.105 8 0.035 a. The average lead time is 5.455 days. (Type the entire number, do not round.) b. The coefficient of variation is %. (Round to two decimal places as needed. Do not round. Do not include % in your answer.)