Compound Probability + Mixed Review

How do you find compound probability?

• Multiply your probabilities
• Add your probabilities
• Divide your probabilities
• Subtract your probabilities

Flip a coin two times

• Independent

• Dependent

Draw a red marble, keep it, then draw a blue marble.

• Independent

• Dependent

A bag contains 5 blue marbles, 4 red marbles, and 3 orange marbles. Mrs. Cox picks one without looking, replaces it and picks another one. What is the probability that she picks two that are not orange? 

A number cube is rolled twice. What is the probability of getting a 6 on the first roll, then a number less than 5 on the second roll? 

What is the probability of picking a blue marble, putting it back in the bag, then picking a red marble?

What is the probability of picking a green marble, keeping it, then picking another green marble?

Lucy has the spinner pictured and spins it twice in a row. What is the probability that she lands on blue first and then on yellow or green?

• 1 / 16

• 1 ⁄ 6

• 1 ⁄ 8

• 3 ⁄ 4

A class has 10 girls and 15 boys. If two students are chosen at random, what is the probability that they are both girls?

A chorus has 50 girls and 35 boys. If two are chosen at random to sing a duet, what is the probability that both will be boys? HINT: You can not have the same person twice in a duet