Probability Review

Probability is ...

• the chance that some event will occur.
• a game that involves coins.
• a guarantee.

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

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

In a drawer, there are 6 white socks, 4 black socks, and 2 brown socks. You pick out a sock, replace it, then pick out a 2nd sock. What is the probability that you will pick a brown, then black sock?

• 1/11

• 1/18

• 1/36

• 2/33

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

CCSS.7.SP.C.8

40% of students in a school wore blue on a Spirit Day. If two students are randomly selected, what is most likely the probability that both students will not be wearing blue?

• 16%
• 36%
• 40%
• 60%

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

A farm has 5 brown cows and 10 white cows. A fence is open and two cows escape. What is the probability that it will be a brown cow, then a white cow?

• 1/9
• 2/9
• 5/21
• 10/21

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

CCSS.7.SP.C.8

You flip a nickel three times.
Find the probability that all flips will land on tails.

• 1/2
• 1/4
• 1/6
• 1/8

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

An event with a probability of one

• experimental probability
• outcome
• certain event
• permutation

Tags

CCSS.7.SP.C.5

Two cards are drawn from a standard deck of cards and no cards are returned to the deck. Identify whether the events are independent or dependent. 

• Independent
• Dependent

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? 

• 1/12
• 1/4
• 1/8
• 1/2

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.8

P(less than 5 and B)

• 1/6
• 1/48
• 6/48
• 1/8

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.8