I have this question in my statistics class, and I am confused on how to answer it:

You just saw a commercial for the Tread Master, an exercise machine that claims an average weight loss of 10 pounds. A commercial for the Climber, a competing product, claims that only 1 out of 10 users of the Tread Master lost any weight at all. The rest of them gained weight. How can both of these claims be true?

I know that unethical sampling can be a reason. However, I am trying to use excel to also show how 1 person could have lost all of the weight needed to render a 10% weight loss average, while the other 9 gained weight. I am lost on how to portray that in excel. Is this correct?

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