2. Someone is telling you how to calculate the SD of the list 1, 2, 3, 4, 5:
The average is 3, so the deviations from average are
-2 -1 0 1 2
Drop the signs. The average deviation is
$\frac{2 + 1 + 0 + 1 + 2}{5} = 1.2$
And that's the SD.
Is this right? Answer yes or no, and explain briefly.