Probability Pre-Algebra

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

If I flip a coin 10 times, how many times should I get heads?

• 1

• 10

• 3

• 5

Six friends are going to play a ball game. Each team has 3 players. How many different team combinations are possible?

• 120

• 6

• 18

• 20

There are 14 tiles with one letter from the word MATHEMATICIANS on each. Find the probability of randomly choosing a vowel.

• 2/3

• 5/14

• 1/2

• 3/7

A jar contains 4 white chips, 5 purple chips, and 1 black chip. Chips are selected randomly one at a time, and are not replaced.
P(white, then purple, then black)

• 1/36

• 2/39

• 5/41

• 6/43

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

Which event is not a dependent event?

• Picking 2 students to be the line leader and the 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 without putting any back

• Picking an earring, replacing it, then picking a 2nd earring

Two fair coins are flipped at the same time. What is the probability that both with display heads?

• 1/2

• 1/4

• 2%

• 1%

A jar contains 4 white chips, 5 purple chips, and 1 black chip. Chips are selected randomly one at a time, and are not replaced. P(purple then black)

• 1/18

• 2/5

• 3/7

• 4/9

You pick a marble from this bag.

What is the probability you will choose either a black or white marble?