I. A study is being conducted to determine if a traffic light is needed to replace a stop sign, owing to the increased traffic at the intersection. The chart below shows the number of cars waiting at the stop sign with the probability of that number of cars occurring. For example, 30 % (30) of the time, there are three waiting to get onto the main road. Complete the table to form a probability distribution and answer the questions. X 0.1 1 0.1 a. Find the population mean. b. Find the population variance. c. Find the population standard deviation. d What is the probability that at least three cars are waiting at the stop sign ? e. What is the probability that less than two cars are waiting at the stop sign ? f. What is the probability that one or more cars are waiting