Question 6.67

67. Manhattan Car Accidents: Number of Vehicles Involved. Refer to Exercise 63.

  1. Calculate and interpret the expected value of the number of vehicles involved in a collision.
  2. Compute the variance and standard deviation of the number of vehicles involved in a collision.
  3. Use the -score method to identify all unusual or somewhat unusual numbers of vehicles involved in a collision.

6.1.67

(a) The expected number of vehicles involved in a crash is 1.9619 vehicles. (b) vehicle squared; vehicle. (c) 4, 5, and 8 vehicles are outliers. 1 vehicle and 3 vehicles are moderately unusual.