John has six bills of paper money in the following denominations: $1, $5, $10, $20, $50, and $100 If he selects 3bills at a time what is the probability of selecting a group that has an average value of between $40 and $45?
A) 0.15
B) 0.05
C) 0.25
D) 0.20

Question

Quizplus · Accepted Answer

The only combination that has an average value between $40 and $45 is $20, $20, and $50. There are 20 possible combinations of 3 bills from 6, so the probability is 1/20 = 0.05.

John Has Six Bills of Paper Money in the Following