Under what circumstances it would be helpful to identify the probability of an event

Brian is undecided as to whether to take a French course or a Russian course. He estimates that his probability of receiving an A grade would be 1/3 in a French course and 2/5 in a Russian course. If Brain decides to base his decision on the flip of a fair coin, what is the probability that he gets an A in Russian?

Suppose the probability of an IRs audit is 4.2 percent for U.S taxpayers who file form 1040 and who earned 100,000 or more.   what are the odds that such taxpayer will be audited?   what are the odds against such taxpayer being audited?

Find the probability of an event E if the odds for E is equal to the odds against

In average the number of people entering the intensive care unit at the particular hospital on any one day is 5 persons per day. What is the probability that the number of people entering the intensive care unit one particular day is two?

If the probability of an event is 72%, what is the probability of its complement?

If the odds against winning a contest are 46 to 1, what is the probability of winning the contest?

If the probability of a person losing on a scratch-off lottery ticket is 0.955, the odds of losing are

In a remote jungle village the probability of a child contracting malaria is .45 the probability of contracting measles is.65 and the probability of contracting both is .20 What is the probability of a child contracting malaria or measles?

If the odds against an event are 4:9, Than the probability that the event will fail to Occur are?