WHICH WILL GIVE GOOD STANDARD DEVIATION
1. (7,0,-7,0,7) 2. (7,-7,7,-7,7) 3. (1,0,-1,0,1)

• (7,-7,7,-7,7)
• 12 years agoHelpfull: Yes(2) No(6)
• 'm not sure what you mean by "good" standard deviation.
  
  Without a calculator, we can tell which will give the highest standard deviation, and which the lowest.
  
  Standard deviation measures spread in a set of data - the "average distance from average".
  
  The first two sets both add to 7, and have 5 pieces of data in them, so they both average to 7/5 = 1.4.
  In the second set, more of the data is further from 1.4 than in the first set, so the second set has a higher standard deviation.
  The third set has all its data very close to 1.4, so it will have a lower standard deviation than set 1.
  So, from lowest to highest standard deviation:
  3
  1
  2
  
  Using the STDEVA command from Excel, I got
  Set 1: STDEVA = 5.9
  2: = 7.7
  3 = 0.8
• 12 years agoHelpfull: Yes(1) No(0)
• 1 -1 1 -1 1
• 12 years agoHelpfull: Yes(0) No(4)