7th grade Probability Practice

A study of 1,500 students revealed that 20 out of 100 prefer cafeteria food for lunch. Based on the results of this study, how many students would not prefer cafeteria food for lunch?

1,200

The results of a random survey showed that 35 out of 80 people planned to vote for Jessica Smith as class president. Which is the best prediction of the total number of votes she would receive if 3,200 people voted?

1,400

In a gym bag there are: 4 basketballs, 4 footballs, 2 soccer balls, 3 cleats, 2 helmets and 1 tennis racquet. Sam chooses a piece of equipment from the bag at random and then replaces it. He then selects another random piece of equipment. What is the probability that Sam selects a tennis racquet and then a helmet?

1/128

In a gym bag there are: 4 basketballs, 4 footballs, 2 soccer balls, 3 cleats, 2 helmets and 1 tennis racquet. What is the probability that Sam randomly selects a basketball, does not return it, and then selects cleats?

1/20

Mildred has a bag of coins. The bag contains 10 dimes, 5 nickels, and 1 penny. She will randomly select 2 coins from the bag one at a time without replacement. What is the probability that she will select a dime first and then a penny.

1/24

During a game, you toss a coin and roll a number cube. You win the game if you get tails and a number greater than 2. What is the probability of winning?

1/3

Tara has two bags of marbles. The first bag contains 6 red marbles, 5 blue marbles, and 4 green marbles. The second bag contains 3 red marbles, 2 blue marbles, and 4 green marbles. Tara will randomly select 1 marble from each bag. What is the probability that Tara will select a blue marble from each bag?

2/27

A basket of beads contains 8 red beads, 6 yellow beads, and 6 green beads. A bead will be drawn from the basket and replaced. What is the probability of drawing a red bead and then a yellow bead?

3/25

Jennifer bakes cookies to sell. She sold 12 out of 28 cookies from her last batch. What is the best prediction of the number of cookies she will sell out of the next 70 cookies she bakes?

30

The 200 students in a school band will attend an awards dinner. A random survey of 25 of these students was conducted to determine how many of each meal should be prepared for the dinner. The results of the survey are shown. 12 students want a beef meal., 8 students want a chicken meal., 5 students want a pasta meal. Based on the survey results, what is the best prediction of how many students would select a chicken meal?

64

The questions on a multiple-choice test each have 4 answer choices. Which model could be used to simulate the outcome of guessing the answers to a 10-question test?

Spinning a four-section spinner 10 times

The questions on a test can be answered with either True or False. Which model could be used to simulate the outcome of guessing the correct answers to a 10-question True-False test?

Tossing a coin 10 times