Answer:
9
Explanation:
List them in order first.
3, 4, 5, 7, 9, 10, 11, 12, 20
Now find the middle number:
4, 5, 7, 9, 10, 11, 12
5, 7, 9, 10, 11
7, 9, 10,
Median = 9
Arranging it in ascending order:
=> 3, 4, 5, 7, 9, 10, 11, 12, 20
Median is the middlemost no. so
=> Median = 9
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