For example,I may not be able to predict whether a coin toss will come out (heads or tails,but I know that when many coins are flipped ()approximately half will turn up (出现)heads and half tails. Likewise((同样地)，if I am selling automobile insurance, I cannot predict whether a particular driver will have an accident,but I can be reasonably sure,judging from past experience,about how many accidents a large group of drivers will have.For example, I may not be able to predict whether a coin toss will come out (出现) heads or tails, but I know that when many coins are flipped (掷), approximately half will turn up (出现) heads and half tails. Likewise(同样地), if I am selling automobile insurance, I cannot predict whether a particular driver will have an accident, but I can be reasonably sure, judging from past experience, about how many accidents a large group of drivers will have