9. Cars arrive at a car wash service randomly and independently. The probability of an arrival is the
same for any interval of equal length. The mean arrival rate is 4 cars per 10 minutes. Which of the
following is/are correct? (A) The probability that less than 2 cars will arrive during any given 10
minutes of operation is 0.0916; (B) The probability that 5 or more cars will arrive during any given 10
minutes of operation is 0.7815; (C) The probability that more than 6 cars will arrive during any given
10 minutes of operation is 0.1107; (D) The probability that exact 9 cars will arrive during any given
10 minutes of operation is 0.0550; (E) The variance of the arrival rate per 10 minutes is 4.