AAC Ch 5 Probability Review

Front

What is the formula to calculate combinations when choosing r items from n items?

Back

C(n, r) = n! / (r!(n - r)!)

Front

How many ways can you choose 2 questions from 5 different questions?

Back

10

Front

What is the probability of an event?

Back

Probability = (Number of favorable outcomes) / (Total number of outcomes)

Front

If Roy has 6 mystery books, 5 science books, 4 history books, and 3 adventure books, what is the total number of books?

Back

Total = 6 + 5 + 4 + 3 = 18 books

Front

What is the probability of choosing an adventure book from Roy's shelf?

Back

P(adventure) = 3/18 = 1/6

Front

If Jamie has 3 raffle tickets out of 100, what is the probability her name is drawn for the second prize after not winning the first?

Back

P(second prize) = 3/99 = 1/33

Front

What is the probability of spinning a red on a spinner that has 3 red, 3 blue, and 3 green sections?

Back

P(red) = 3/9 = 1/3

Front

If you spin a spinner 3 times, what is the probability of getting red, odd, and 3?

Back

P(red, odd, 3) = 1/72

Front

What are odds in favor of an event?

Back

Odds in favor = (Number of favorable outcomes) : (Number of unfavorable outcomes)

Front

What are the odds in favor of selecting a dime from a dish with 11 pennies, 6 nickels, 5 dimes, and 3 quarters?

Back

Odds in favor = 5 dimes : (11 + 6 + 3) = 5 : 20 = 1 : 4