Five pulse rates are randomly selected from a set of measurements. The five pulse rates have a mean of 77.2 beats per minute. Four of the pulse rates are 65, 77, 86, and 66.

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 aredetermined? (The result is referred to as the number of degrees offreedom.)