QUIZ 1: PROBABILITY

Three coins are flipped. What is the probability that there will be at least two tails?

1/2

Suppose there are 21 students in your class. If the teacher draws 2 names at random, what is the probability that you and your best friend will be chosen?

1/210

Suppose you are asked to pick 3 numbers from 1 to 20 to win a prize. What is the probability that one of the numbers you will pick is the winning number? 5% 10% 15% 20%

15%

What is the experimental probability of drawing a red marble, given the following results?

2/5

You have 2 spreads, 5 meats, and 2 kinds of bread. How many different sandwiches can you make using one of each type of ingredient? 9 12 20 40

20

A number cube is rolled and a coin is flipped. Predict how many times you would get heads and a number less than 3 in 240 trials. 60 40 30 20

40

There are 6 red marbles, 8 blue marbles, and 11 green marbles in a bag. What is the probability that you will randomly draw either a red or a blue marble? 24% 56% 32% 10%

56%

At a carnival game, there is a 38% probability of winning a prize. What is the probability of not winning a prize? 38% 50% 62% 76%

62%

A coin is flipped 40 times, and it lands on heads 16 times. Based on the experimental probability, how many heads would you predict for 200 flips of the coin? 90 80 56 112

80

Alice and Finn roll two number cubes. Which of the following rules will make the game fair? Alice wins if a total of 5 is rolled. Finn wins if a total of 9 is rolled. Alice wins if a total of 7 is rolled. Finn wins if a total of 8 is rolled. Alice wins if a total of 3 is rolled. Finn wins if a total of 10 is rolled. Alice wins if a total of 4 is rolled. Finn wins if a total of 11 is rolled.

A

There are 3 red marbles, 5 green marbles, and 2 blue marbles in a bag. Which of the following are true? The probability of randomly drawing either a red marble or a green marble is 80%. The probability of randomly drawing a red marble and then a green marble is 1/6 . The probability of not drawing a blue marble is 20%. The probability of drawing a green marble is the same as the probability of drawing either a red or a blue marble.

The probability of randomly drawing either a red marble or a green marble is 80%. The probability of randomly drawing a red marble and then a green marble is 1/6. The probability of drawing a green marble is the same as the probability of drawing either a red or a blue marble.

A coin is flipped and a number cube is rolled. Which of the following are true? The sample space has 12 different outcomes. The sample space has 8 different outcomes. Each result is equally likely. Heads and an even number are very likely.

The sample space has 12 different outcomes and Each result is equally likely.

A spinner is divided into 4 equal sections. Which of the following are true? The spinner will land on each section of the spinner an equal number of times. The theoretical probability is 25% for each section. If the spinner is spun 64 times, you would predict it to land on each section 16 times. The experimental probability is 1/4 for each section.

The theoretical probability is 25% for each section. If the spinner is spun 64 times, you would predict it to land on each section 16 times.

Which of the following are dependent events? rolling a number cube and then flipping a coin spinning a spinner and then rolling a number cube drawing a marble from a bag, not replacing it, and then drawing a second marble choosing a number from a hat, replacing it, and then choosing another number

drawing a marble from a bag, not replacing it, and then drawing a second marble

What is the probability of rolling an odd number and spinning "B," given the sample space below?

not 1/2