the numbers refer to the type of guard used on the buzzers . If The type of guard used is a 2 your hair is getting cut at 2 mm.
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If you mean 2 and 3/4, it is 2.75.
1, 2, 2, 3, 4, 4, 5, 7, 8 Mean: 4 Median: 4 Mode: 2 and 4
4
2.6
The arithmetic mean is 2.