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The numbers are 2, 8, 16, 21, 3, 8, 9, 7, 6.

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To find the median, order the numbers from least to greatest.

2, 3, 6, 7, 8, 8, 9, 16, 21.

There are odd number of items. so, middle number of the above numbers.

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In the given numbers 8 is appears two times.so, the mode is 8. \ \ $\"\"$

The mean is 8.89, median is 8 and mode is 8.