题目
If the probability that Zolaf Company sales exceed last year's sales is 0.167, the odds for exceeding sales are closest to:
选项
A.1 to 5.
B.1 to 6.
C.5 to 1.
答案
A
解析
： A is correct. Given odds for E of a to b, the implied probability of E = a/(a + b). Stated in terms of odds a to b with a = 1, b = 5, the probability of E = 1/(1 + 5) = 1/6 = 0.167. This result confirms that a probability of 0.167 for beating sales is odds of 1 to 5. ： A正确。这里要求的是exceeding sales的odds for。所以for后面的“exceeding sales”就是对应的事件该事件发生的概率题干给出是0.167.odds for=P(E)/[1-P(E)]=0.167/(1-0.167)=0.2