Rewrite given data in increasing order:
28, 61, 63, 65, 66, 67, 68, 69, 82, 86, 87
An outlier is an observation that lies an abnormal distance from other values in a random sample from a population. As you can see that number 28 lies an abnormal distance from other values.
Answer A: 28
The mean (or average) of a set of data values is the sum of all of the data values divided by the number of data values.
Answer B: 67.45
Answer C: 71.4