Standard deviation formula: Root[ Sum[ (xi - mean)^2 ] ] /n
City A: (n = 5)
1.00 1.00 1.50 1.00 1.50
Mean A: (1.00 + 1.00 + 1.50 + 1.00 + 1.50)/5 = 1.20
Std A: 0.27
City B: (n = 5)
2.00 1.00 1.50 0.00 1.75
Mean B: (2.00 + 1.00 + 1.50 + 0.00 + 1.75)/5 = 1.25
Std B: 0.79
