Dependent or Independent Probability

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?

• Simple

• Independent

• Dependent

If you draw out a red marble, keep it, then draw out a blue marble, is it independent or dependent probability?

• Independent

• Dependent

If you flip a coin then roll a number cube, is it independent or dependent probability?

• Independent

• Dependent

If you flip a coin two times, is it independent or dependent probability?

• Independent

• Dependent

What is the probability of picking a green marble, keeping it, then picking green again? (leave answer in fraction form in lowest terms)

• 1/7

• 1

• 1/49

• 0

What is the probability of picking a red marble and keeping it, picking another red marble and keeping it, then picking a blue marble? (leave answer in fraction form in lowest terms)

• 2/105

• 4/343

• 2/63

• 4/210

Valentina has 3 raffle tickets. One hundred tickets were sold. Her name was not drawn for the first prize. What is the probability that her name will be drawn for the second prize? (leave answer in fraction form in lowest terms, and remember that the first ticket was already drawn out and was not replaced)

• 1/3

• 1/33

• 3/100

• 2/99

A coin and a number cube with the numbers 1 through 6 are tossed. What is the probability of the coin showing tails and the number cube showing the number 3? (leave answer in fraction form in lowest terms)

• 1/12

• 1/4

• 1/8

• 1/2

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? (leave answer in fraction form in lowest terms)

• 2/3

• 1/9

• 5/36

• 1/12

Ricardo has the spinner pictured here and a bag of marbles filled with 2 red marbles, 3 green marbles, and 3 blue marbles. What is the probability that Ricardo spins red on the spinner and picks a red marble out of the bag? (leave answer in fraction form in lowest terms)

• 1/16

• 1/4

• 1/2

• 1/8