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A compound event is one in which there is more than one possible outcome. Determining the probability of a compound event involves finding the sum of the probabilities of the individual events and, if necessary, removing any overlapping probabilities.
Probability is the likelihood that an event will occur. It is written as a fraction with the number of favorable outcomes as the numerator and the total number of outcomes as the denominator. Favorable just means that a particular outcome is what you are curious about, not that it is necessarily positive.
Probability can be used to determine many things, from the likelihood that you will win the jackpot in the lottery to the likelihood that a baby will be born with a certain birth defect and anything in between. Probability is used extensively in the sciences, investing, weather reporting and many other areas.
1.) What is the probability that you will roll a five using a 6-sided die?
The favorable outcome is rolling a five, and that can only occur once using one die. The total number of outcomes is six, since the die is 6-sided.
So the probability of rolling a five is 1/6.
2.) What is the probability that you will pull a heart out of a standard deck of cards?
The favorable outcome would be pulling a heart and there are 13 of them in a standard deck. The total number of outcomes is 52 because there are 52 cards in a standard deck.
The probability of pulling a heart is 13/52 or 1/4.
Probability of Compound Events
A compound event is an event with two or more favorable outcomes. There are two types of compound events and determining the probability for each is different.
Exclusive Compound Event
An exclusive compound event in one in which the multiple events do not overlap. The method for determining the probability of this type of compound event is to add together the probabilities of each event. The sum is the probability of the compound event. In mathematical terms - P(C) = P(A) + P(B)
1.) What is the probability of rolling either a two or a four using one 10-sided die?
The probability of rolling a two is 1/10 and the probability of rolling a four is 1/10. So, the compound probability is
P(C) = 1/10 + 1/10 = 2/10 or 1/5
2.) What is the probability of pulling any face card or a three of clubs from a standard deck of cards?
The probability of getting a face card is 12/52 and the probability of getting a three of clubs is 1/52, so the compound probability is. this should help you.