Dependent and Independent Events in Probability

Which event is not a dependent event?

• Picking 2 students to each be line leader and door holder from a group of 20 students
• Picking 2 marbles from a bag without replacing the first marble
• Picking 2 crayons from a box at the same time (simultaneously) 
• Picking an earring, replacing it, then picking a 2nd earring

Describe the event as independent or dependent: Susie draws a card from a deck of cards and replaces it. She then draws a second card.

• Independent
• dependent

Describe the event as independent or dependent: Seth draws a colored tile from a bag, replaces; draws a second tile from the bag, replaces it; and then draws a third tile.

• independent
• dependent

Find the probability of: P(A and not 2)

• 1/12
• 1/6
• 1/2

Describe the event as independent or dependent: You draw a red marble from a bag and then another red marble (with out replacing the first marble.)

• independent
• dependent

Find the probability of: P(A and 2)

• 1/12
• 1/24

Find the probability of: P(D and 1)

• 1/12
• 1/24
• 1/8

A box contains 3 red marbles, 6 blue marbles and 1 white marble. The marbles are selected 1 at a time and not replaced. Find P(blue and red)

• 9/50
• 1/5

Suppose two tiles are drawn from the collection shown. The first tile is replaced before the second tile is drawn. Find P(A and A)

• 4/225
• 1/100
• 1/5

Suppose two tiles are drawn from the collection shown. The first tile is  not replaced before the second tile is drawn. Find P(A and A)

• 4/225
• 1/105
• 3/71