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The numbers are 2, 8, 5, 18, 3, 5, 6.

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

2, 3, 5, 5, 6, 8, 18.

There are odd number of items. hence middle number is median of given series.

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In the given numbers 5 appears 2 times.so, the mode is 5. $\"\"$

The mean is 6.7, median is 5 and mode is 5.