7th Grade Probability

Theoretical

Experimental

Probability

Probability2

How likely is it.

100

Maria is flipping a coin and spinning a spinner. The spinner has 4 equal sections labeled A-D. What is the probability the coin will land on heads and the spinner will land on the letter "A"?

1/8 or 0.125, or 12.5%

100

Hannah is playing basket ball and makes 15 out of 25 free-throw shots. What is the probability she all make the next free throw shot?

15/25 = 3/5, .60, 60%

100

Why is the difference between experimental and theoretical probability?

What is the theoretical probability is what you expect should happen while experimental probability is what actually happens during the event.

100

Which of the following events has the greatest theoretical probability?

a. Tossing a 5 on the number cube labeled 1-6.

b. tossing a penny and having it land tails up.

c. Spinning a 7 on a spinner with 5 sections labeled 2, 4 , 6, 8, and 10.

d. Pulling a green ribbon randomly from a bag with 1 red, 1 yellow, and 3 green ribbons.

100

How many possible outcomes are there if you roll 2 dice?

200

Delcon spins a spinner two times with the number 1-4 on it. How many outcomes are possible?

a. 4

b. 8

c. 12

d. 16

200

Ms. Moran puts names on a piece of paper and randomly selections students to participate in an activity. She has selected a girl 6 out of 20 times. What is the probability she pull out a boys name?

14/20 = 7/10, .70, 70%

200

what are the possibilities for these outfits use a tree diagram

shirt

(red, blue, black)

pants

(formal, sweatpants, shorts, khakis)

shoes

(black, white, formal, sneakers)

RED-f,sp,s,k-b,w,f,s

BLU-f,sp,s,k-b,w,f,s

BLK-f,sp,s,k-b,w,f,s

48 outfits

200

A spinner has three equal sections. The following tables gives the results of 60 spins on the spinner.

outcome frequency

blues 25

red 18

yellow 17

How much greater is the experimental probability of landing on blue than the theorectical probability of landing on blue?

a. 1/4

b. 1/10

c. 1/12

d. 1/20

c. 1/12

200

How likely is it that a number cube is tossed and lands on 3?

Unlikely

300

Delcon spins a spinner two times with the number 1-4 on it.

What is the probability of landing on the number 1 with the first spin and 2 with the second spin?

a. 1/16

b. 1/12

c. 1/8

d. 1/4

a. 1/16

300

A letter tile is randomly selected from a bag, recorded, and replaced 100 times. The results are listed below. What is the experimental probability of selecting the letter "E"? A = 16 E = 11 I = 29 O = 19 U = 25

11/100 or 0.11, or 11%

300

You flip a coin and spin a spinner with 5 different colored, equal sections. What is the probability of landing on heads and red?

1/10

300

The following outcomes gives the results of tossing a number cube 50 times.

2 5 3 6 5 4 6 6 3 1

4 2 2 4 1 6 5 3 3 6

5 3 2 5 4 6 6 1 3 5

3 1 4 4 3 1 2 5 5 2

6 4 1 3 3 2 1 1 3 6

Which of the following is the experimental probability of tossing a 3 expressed as a percent?

a. 11%

b. 17%

C. 20%

d. 22%

300

How likely is it that a a dice numbered 1 through 6 is tossed and it lands on 8?

impossible

400

There are 3 red marbles, 2 green marbles, and 1 yellow marble in a box. What is the probability that you select a red marble?

1/2, or 0.50, or 50%

400

Pedro recorded the types of birds that visit his bird feeder. Based on the results below, what is the probability the next bird will be a chickadee? Woodpecker = 3 Chickadee = 5 Cardinal = 1 Sparrow = 13 Blue Jay = 3

1/5, or 0.20, or 20%

400

Sarah flips a coin and rolls a die. What is the probability of landing on heads and landing on 5?

1/12

400

Mr. Perez designs a probability model to help him predict which color car high customers will want to buy. He puts equal numbers of red, black, white, gray, and blue slips of paper into a bag to represent all the different possible car colors. Which of the following statements about the model are true?

a. Mr. Perez will most likely not pull any black slips.

b. Mr. Perez is more likely to pull a red slip than a blue slip.

c. Adding another white slip would make this a non-uniform probability model.

d. The results of Mr. Perez's experiment are likely to exactly match the frequency with which his customers select each color car.

a. Mr. Perez will most likely not pull any black slips.

400

How likely is it that a dice is tossed and lands on any number 1-6?

Certain

500

Jay spins a spinner with 5 equal sections numbered 1-5. What is the probability he will spin a 1 or a 3?

2/5 or 0.40, or 40%

500

You roll a dice 50 times and list the following outcomes: 1 - 15 times 2 - 10 times 3 - 5 times 4 - 10 times 5 - 10 times What is the probability the next roll will be a 3?

5/50 = 1/10, .10, 10%

500

You are trying to decide what movie to see. 2 movies are comedies, 3 are scary movies, and 5 are action movies. What is the probability you will see an action movie or a scary movie?

8/10, .80, 80%

500

For each situation, tell whether the situation is unlikely, likely, or neither likely nor unlikely.

a. Drawing a 10 from a bag with 100 slips of paper numbered 1-100.

b. Rolling a number less than 5 on a number cube labeled with the numbers 1-6.

c. Drawing a red marble from a bag containing 8 red and 8 blue marbles.

a. unlikely

b. likely

c. neither likely nor unlikely

500

If I roll 2 dice what is the possibility that I roll an even number?

1/2