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Average and Median

Average is one of the Statistical Value . It is useful as represent of data set.

Weakness of Average

But in fact, we fail analysis when we use Average. There are two reasons.

• Average is influenced by irregular data.
• Data set is not normalized.

• It is a way to avoid first fact that we delete irregular data and calculate average again. But defining regular and irregular is not easy.
• Second fact is same to the problem that "How we find the data near the top of the distribution ?"

Median

Median is easy substitution of Average. First reason is that when the distribution is normal, Median is same to Average. Second reason is Median is strong from the influence of irregular data.

Median is used in Box Plot .

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