:11. Solution.  Adding the same number to each member of a
list does not change its SD.  Adding 1 to each member of
-1,-1,-1,-1,1, we see that 0,0,0,0,2 has the same SD.  But
0,0,0,0,2 is obtained from 0,0,0,0,1 by multiplying each member
by 2.  Multiplying each member of a list by a positive number
multiplies the SD by the same number.  Since the SD of 0,0,0,0,1
is .4, the SD of 0,0,0,0,2 is .8