Range is highest minus smallest so 12-9 = 3
One possible set is {9, 9, 10, 11, 12, 15, 18}
The numbers are -12, -11, -10 and -9.
The range is 11. (14 - 3 = 11)
12/11 = 108/99 10/9 = 110/99 10/9 - 12/11 = 2/99 12/11 - 10/9 = -2/99
11 hours 10 to 12 = 2 12 to 9 = 9 2 + 9 = 11
For 8 9 9 9 10 11 11 12: σ=1.3562
The average is 10... 11+11+9+7+12=50... 50/5=10
LCM(11, 12, 9, 10) = 1980.
10
10
12+8+10+12+11+9 = 62
11 over 12 is greater. 9/10=0.9 11/12=0.92