Seventytwo federal law enforcement ofcers were asked the number of times then needed to use a "tool" to maintain law and order while interacting with the public. The results are given in the following graph. Find the approximate number of responses that were three. 0.45 F' a: m P H U'l Relative Frequency 5:: M 01 0 1 2 3 4 5 6 Number of Times a \"Tool" was needed