Using the original example of five weights, the researchers add a sixth participant to the sample.

(a) If the sixth participant weighs 240 pounds, will the mean increase, decrease, or not change? 

(b) If the sixth participant weighs 200 pounds, will the mean increase, decrease, or not change? 

(c) If the sixth participant weighs 180 pounds, will the mean increase, decrease, or not change?

A group of researchers measures the weight of five participants prior to a clinical weight loss intervention. They record the following weights (in pounds): 200, 250, 150, 100, and 300 pounds. The mean is 200 pounds.