The median of a set of values is the number in the mid-ordinal position of the set in ordered form.
To find the median of a set of number, first put them in order and then the median is the one in the middle. If there are 2n+1 numbers (n = integer) then the median is the n+1th number. If there are 2n, then the median is either defined as the the average of the nth and n+1th numbers.
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The median is the middle number
They are all forms of average.
Average is a synonym for mean (the mathematical term not the adjective)
No. By definition of the median, the median has 50 percent of the case below and 50 percent of the cases above. This has nothing to do with the cases being in a normal distribution.
By definition yes. The median is the number which is exactly in the middle of a set of numbers. The first quartile is the point where 25% of the numbers are to the left, and 75% of the numbers are to the right.