Adding Probabilities. Simple Event- One event. Compound Event- Two or more simple events. Mutually Exclusive Events- Two events that cannot occur at the.

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Presentation transcript:

Adding Probabilities

Simple Event- One event. Compound Event- Two or more simple events. Mutually Exclusive Events- Two events that cannot occur at the same time. Inclusive Events- Two events whose outcome may be the same.

If two events, A and B, are mutually exclusive, then the probability that A or B occurs is the sum of their probabilities. P(A or B) = P(A) + P(B)

Keisha has a stack of 8 baseball cards, 5 basketball cards, and 6 soccer cards. If she selects a card at random from the stack, what is the probability that it is a baseball or soccer card?

One teacher must be chosen to help supervise a senior class fund- raiser. There are 12 math teachers, 9 language arts teachers, 8 social studies teachers, and 10 science teachers. If a teacher is chosen at random, what is the probability that the teacher is either language arts or social studies?

There are 7 girls and 6 boys on the junior class homecoming committee. A subcommittee of 4 people is being chosen at random to decide the theme for the class float. What is the probability that the subcommittee will have at least 2 girls?

The Cougar basketball team can send 5 players to the basketball clinic. Six guards and 5 forwards would like to attend the clinic. If the players are selected at random, what is the probability that at least 3 of the players selected to attend the clinic will be forwards?

Inclusive means the events are not mutually exclusive If two events, A and B, are inclusive, then the probability that A or B occurs is the sum of their probabilities decreased by the probability of both occurring P(A or B) = P(A) + P(B) – P(A and B)

Suppose that of 1400 students, 550 take Spanish, 700 take Biology, and 400 take both Spanish and Biology. What is the probability that a student selected at random takes Spanish or Biology?

Sixty plastic discs, each with one of the numbers from 1-60, are in a bag. LaTanya will win a game if she can pull out any disc with a number divisible by 2 or 3. What is the probability that LaTanya will win?

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