it means the middle number in upper half of the data a box and whisker plot is a line with a box and has 3 points on box ;; median in middle, lower quartile on left point, and upper quartile on left point. on the end of the line on the left put your lower extreme ;; and on the end of the line on the right put your upper extreme.
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Expressing statistical data
The whiskers mark the ends of the range of figures - they are the furthest outliers. * * * * * No. Outliers are not part of a box and whiskers plot. The whiskers mark the ends of the minimum and maximum observations EXCLUDING outliers. Outliers, if any, are marked with an X.
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Both ends of the the box (the "whiskers") plot determine the range of your data, without including outliers. (Outliers are marked by an asterisk). The end of the left side of the box is the lower quartile. The line in the box is the median. The other end of the box represent the upper quartile.
It was invented by the American statistician John Tukey in 1977