A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 15.1 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 14.1, 171, 18.1, 19.1, 16.1, 21.1, and 22.1 pounds. What is the sample mean?
13.133
18.2
3.363
15.1