It is the upper quartile.
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The median is the midpoint of the data set. So half the observations are greater than the median and half are smaller.
It is the lower quartile.
Because, if there is an even number of results in the set of data, the mean must be calculated by finding the half-way point between the two central numbers.
No, they must have a median. However, if the data set is of even order, the median may not belong to the data set. For example, the median of 1,2,3,10 is halfway between 2 and 3 or 2.5 which is not a data point.
You can't. You can get the median and mode from the data set, but not the histogram itself.