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It is one of the key measures of a data set: it shows the value around which the observations are spread out.
variance
A frequency distribution plot.
The median must be at least as great as the first quartile in any data set. Normally it would be greater.The median must be at least as great as the first quartile in any data set. Normally it would be greater.The median must be at least as great as the first quartile in any data set. Normally it would be greater.The median must be at least as great as the first quartile in any data set. Normally it would be greater.
Yes, if the lowest data value is negative.