Suppose that on a certain section of SRP with a posted speed limit of 65 kph, the speeds of all vehicles have a bell-shaped distribution with a mean of 72 kph and a standard deviation of 3 kph. Using the empirical rule, find the percentage of vehicles with the following speeds on this section of SRP. 63 to 81 kph 69 to 75 kph b) Using the empirical rule, find the interval that contains the speeds of 95% of vehicles travellin