3) Lisa Hertscar, a civil engineer, needs to determine if a traffic light needs to replace a stop sign at a particular intersection. She keeps track of the number of cars that enter the intersection at randomly chosen times of the day between 8am and 10pm over the course of 60 days. The results are as follows: 65 15 23 72 20 56 32 55 52 27 51 35 47 63 36 38 26 56 46 52 48 62 33 70 57 44 47 43 41 46 38 53 51 45 57 62 60 21 47 55 53 46 37 43 56 58 66 46 49 68 32 55 49 42 68 53 46 57 52 57 a) Construct a frequency table. b) Add a relative frequency column to the frequency table you (Starting with 15