The number that lies in the middle of 9 and 12 is 10.5. This is calculated by adding 9 and 12 together to get 21, and then dividing by 2 to find the average, which is 10.5. In a number line, 10.5 would be equidistant from both 9 and 12.
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It is 9, the middle number when they are listed in order.
10
8. In order: 4, 6, 7, 9, 10, 12 6 data items so median is mean of middle two: median = (7+9)/2 = 8.
Sample size: 12 Sorted sample: 3, 5, 6, 6, 7, 7, 8, 9, 9, 9, 10, 10 Middle numbers: 7, 8 Average of middle numbers, known as median: 7.5
8! Because 8 would be in the middle of the numbers!