Two coins are tossed simultaneously. What is the probability of tossing two heads?

A coin is tossed three times. What is the probability of tossing exactly two heads?

Two standard dice are rolled. What is the probability of rolling a total of 9?

If the odds in favour of rain tomorrow are 4:7, what is the probability of rain tomorrow?

If a bowl contains ten chocolates and eight jelly beans, what is the probability that four of the candies will be chocolates?

Two standard dice are rolled. What is the probability that a sum less than 7 is not rolled?

A stable has 15 horses available for trail rides. Of these horses, 6 are all brown, 5 are mainly white and the rest are all black. If Maria selects one at random, what is the probability that this horse will: a) be black? b) not be black?

A number is chosen randomly from the first 20 natural numbers (1 to 20). If event A = {a multiply of 5}, what is the value of P(A')?

If the odds against the Blue Jays winning this year's World Series are 20:1, what is the probability that the Blue Jays will win this series?

Describe how to calculate the odds against an event happening when you know the probability of the event occuring. Use a numerical example to illustrate your explanation.