Probability Review

The spinner shown is spun once. Find each probability.
1. P(odd)

• 2/8
• 4/8
• 1/2
• 3/8

Tags

CCSS.7.SP.C.7B

The spinner shown is spun once. Find each probability.
2. P(3, 6, or 8)

• 1/8
• 3/8
• 1/4
• 2/8

Tags

CCSS.7.SP.C.7B

The spinner shown is spun once. Find each probability.
3. P(less than 3)

• 1/2
• 1/3
• 5/8
• 1/4

Tags

CCSS.7.SP.C.7B

During lunch at Urbana Middle School today, several students have brought their lunch from home and several students are ordering a school lunch as shown in the table. Suppose one student is randomly selected during lunch time. Find the probability of each event. Write as a fraction in simplest form.
4. P(order school lunch)

• 9/20
• 7/20
• 1/3
• 1/6

Tags

CCSS.7.SP.C.7B

During lunch at Urbana Middle School today, several students have brought their lunch from home and several students are ordering a school lunch as shown in the table. Suppose one student is randomly selected during lunch time. Find the probability of each event. Write as a fraction in simplest form.
5. P(brought lunch from home or ordered school lunch)

• 1/2
• 0
• 1
• 2/3

Tags

CCSS.HSS.CP.B.7

6. P(6th grader)

• 32/50
• 8/25
• 1/3
• 16/50

Tags

CCSS.7.SP.C.7B

7. P(not 7th grader)

• 7/10
• 11/15
• 13/20
• 1/20

Tags

CCSS.7.SP.C.7B

8. P(7th grader or 8th grader)

• 3/5
• 15/17
• 13/20
• 17/25

Tags

CCSS.HSS.CP.B.7

9. Scott has 8 T-shirts and 12 dress shirts in his wardrobe. What is the probability of selecting a dress shirt from his wardrobe?

• 3/5
• 1/5
• 2/5
• 4/5

Tags

CCSS.7.SP.C.7B

10. There are 3 yellow, 3 green, and 3 red pens in a jar. Each day Michelle selects a pen without looking, uses the pen, and then replaces it in the jar. Over 14 days she selects a red pen 6 times. Compare the theoretical and experimental probabilities of this experiment.

• Experimental probability (3/7) is slightly less than the theoretical probability (⅓).
• Experimental probability (1/3) is slightly greater than the theoretical probability (3/7).
• Experimental probability (3/7) is slightly greater than the theoretical probability (1/3).
• Experimental probability (1/3) is slightly less than the theoretical probability (3/7).