Percentiles A union leader is told that, when all workers’ salaries are considered, the first quartile is $20,750. Explain what that means.

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When you order a series from least to greatest (left to right), you can then pick the median. If you look at the part of the series that's to the left of the median, you can divide that part of the series in two (in effect, picking the median of the part of the series that's to the left of the median). This "median of a median" is your first quartile!

i dont get what u wrote!!!

I'll draw a picture.

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