13) How do you know when to use the mean or median as the best measure of center?

The mean is the most common measure of center. It is what most people think of when they hear the word "average". However, the mean is affected by extreme values so it may not be the best measure of center to use in a skewed distribution. The median is the value in the center of the data.

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hope this helps

answer: what is the question you're trying to ask?

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b segment jm is correct i think