The humidity dropped an average of 1 1/3% each hour over the last six hours. What was the total change in humidity?
A: -8%
B: -6 1/3%
C: -7 1/3%
D: -6 1/2
A: -8%
B: -6 1/3%
C: -7 1/3%
D: -6 1/2