Suppose we have a sample of 245 patients who have undergone gastric bypass surgery. Their average weight loss 6 months after surgery is 62 pounds, with a standard deviation of 9.4 pounds. Which of the following patients is an outlier?
a.The patient who lost 40 pounds
b.The patient who lost 20 pounds
c.The patient who lost 66 pounds
d.The patient who lost 90 pounds