9/26 AMDM: Unit 2 Test REVIEW

You roll a die twice. What is the probability that you roll a 6 the first time and a 3 the second time?

• 1/36

• 1/2

• 1/12

• 3/6

Answer explanation

There are 6 sides on a die. There is a 6 on only 1 side and a 3 on only one side. The work is:

1/6 x 1/6 = 1/36.

What is the probability of NOT pulling a reddish-orange marble? Your answer should be a reduced fraction.

• 1/6

•  1/3

• 1/2

• 5/6

Answer explanation

There are 12 marbles. 2 of the marbles are reddish-orange. The question said the probability that you choose a marble that is NOT reddish-orange. That means 10 marbles work.

10/12 = 5/6

James plays the arrow spinner game. What is the probability he will land on number 3? Write your answer as a fraction. Make sure your fraction is in reduced form. Use / between your numbers and no spaces.

Answer explanation

There are 8 spaces in all and the number 3 is on only one space.

1/8

Tags

CCSS.7.SP.C.7A

A regular 6-sided die is to be rolled once. What is the probability that a number less than or equal to 4 is rolled?

• 1/2

• 1/4

• 5/6

• 2/3

Answer explanation

Less than or equal to 4 means we have to include the 4. Therefore, there are 4 choices that work out of 6 total.

4/6 = 2/3

Tags

CCSS.7.SP.C.7B

A regular 6-sided die is to be rolled once. What is the probability that a number less than 3 is rolled?

• 1/3

• 1/6

• 1/2

• 2/3

Answer explanation

Less than 3 means we DO NOT include the 3. Therefore, there are 2 choices that work out of 6 total. 2/6 = 1/3

Tags

CCSS.7.SP.C.7A

If you choose from the following M & M colors, what is the probability that you choose blue?
5 green
6 yellow
8 blue
7 brown

• 3/13

• 4/13
• 4/9

• 9/13

Answer explanation

5+6+8+7 = 26 total m&ms.

There are 8 blue m&ms. 8/26 = 4/13

Tags

CCSS.7.SP.C.7B

If you spin two times, what is the probability of landing on green the first time and then landing on not green the second time.

• 1/6

• 1/36

• 5/36

• 1/18

Answer explanation

There are 6 spaces on the spinner. Green is on 1 space. Prob of landing on green is 1/6. Probability of landing on a space that is NOT green is 5/6. Therefore, the probability of first landing on green and then landing on not green is:

1/6 x 5/6 = 5/36

A bag contains 30 pieces of candy. There are 15 grape, 7 cherry, 3 lemon, 5 strawberry. What is the probability of choosing a lemon?

• 3
• 1/10
• 3/10
• 30%

Answer explanation

There are 30 pieces of candy. 3 pieces are lemon. Probability of choosing a lemon candy is 3/30 = 1/10

Tags

CCSS.7.SP.C.7B

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

• Independent

• Dependent

Answer explanation

Coin flips are always independent. You don't subtract. You cannot take one of the sides off of a coin!

Tags

CCSS.HSS.CP.A.5

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

Answer explanation

There are 7 total marbles, 3 of which are green. When you choose the first marble, the probability is 3/7. You keep the first marble, so when you start to choose the second marble you have 6 total, 2 of which are green. The second fraction is 2/6.

The probability of both happening is:

3/7 x 2/6 = 1/7.