Five pulse rates are randomly selected from a set of measurements. the five pulse rates have a mean of 72.472.4 beats per minute. four of the pulse rates are 7878, 6060, 9191, and 8282. a. find the missing value. b. suppose that you need to create a list of n values that have a specific known mean. some of the n values can be freely selected. how many of the n values can be freely assigned before the remaining values are determined? (the result is referred to as the number of degrees of freedom.)