Probability Dependent Independent

A bag contains 5 striped cubes, 3 dotted cubes, 4 white cubes and 3 red cubes. What is the probability of drawing a red cube, replacing it, and then drawing a white cube?

• independent

• dependent

A bag contains 2 striped cubes, 3 dotted cubes, 4 white cubes and 3 red cubes. What is the probability of drawing a white cube, not replacing it, and then drawing a dotted cube?

• dependent

• independent

Independent probability happens when the probability of the first event does not affect the probability of the second event.

• True

• False

A bag contains 5 quarters, 2 dimes, and 4 pennies. What is the probability of picking a quarter, not replacing it, and then picking a penny?

• 20/121

• 8/121

• 2/11

• 4/55

A box contains 3 brand A batteries and 7 brand B batteries. 30% of brand A batteries are faulty and 40% of brand B batteries are faulty. A battery is selected at random and then checked to see if it is faulty. What is the probability that a not faulty brand A battery is selected?

• 0.21

• 0.09

• 0.28

• 0.25

This jar contains 20 pieces of bubble gum. The green ones are Tisha's favorite flavor. Her teacher told her she can have two pieces. What is the probability she will randomly pick two green?

• 1/4

• 1/2

• 9/38

• 18/45

You are playing a game of scrabble. The tiles shown are dropped in a bag. You need to choose two tiles. What is the probability of choosing an "E", keeping it, and then choosing a "H"?

• 4/15

• 1/70

• 1/75

• 1/225

Each letter of the word Banana is written on a card. Find each probability if you pick two cards without replacing the first. What is the probability of picking and N and then an A?

p(N, then A)

• 1/15

• 1/5

• 1/10

• 2/3

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

• 9/49

• 1/7

• 3/14

• 6/42

Match each to its probability.

• 12/180

• P(keyboard | 7th grade)

• 40/180

• P(drums and 8th grade)

• 12/40

• P(drums or 8th grade)

• 81/180

• P(7th grade | keyboard)

• 12/60

• P(keyboard)