Katie and katy are roommates who share the same bathroom scale. neither K or K is on a special diet to lose or gain weight. each morn they both weigh themselves. from day to day, it seems that each gains or loses 2 pounds. other days katie gains 3 pounds and kathy looses 2. every day their weights are different from their weights the previous day, and they cannot distinguish a pattern. they decide to start weighing themselves on a scale at the wellness center. to their surprise, they neither gain or lose weight from time to time when using the scale at the wellness center. which of the following best explains the situation