All About Probability
Fill in the blank:
Probability is always expressed in __________ numbers. #NoNegatives
positive
Jamey wants to take the train to visit his grandma today. There are only 4 trains that will take him there. He has missed all 4 trains. How likely is it for Jamey to take one of the trains today?
A. Certain B. Likely C. Unlikely
D. Impossible E. Equally likely as unlikely
D. Impossible
A six-sided dice is rolled 40 times. What is the theoretical probability of rolling a 1 or 2?
1/3
Fill in the blank:
Probability must be between ______ and ______.
zero and one
The forecast says there is a 5/6 chance of thunderstorms. How likely is it?
A. Certain B. Likely C. Unlikely
D. Impossible E. Equally likely as unlikely
B. Likely
For school breakfast, the food choices are an apple, a banana, or a muffin. The drink choices are chocolate milk or grape juice.
What is the probability someone may choose both a banana AND chocolate milk?
1/6
True or False:
The more experimental trials/experiments you do the more likely you will get closer to the theoretical probability.
True
The Nelsons are getting a new puppy. What is the probability it will be a boy?
A. 2/2 B. 1/2 C. 0/2 D. 1/1
B. 1/2
There are 15 starbursts left in the bag, 7 of them are pink. What is the probability that both Aleah and Eden grab a pink starburst?
Aleah picks first and doesn't put hers back in the bag. Eden picks after Aleah.
42/210 or 1/5
Is this a valid probability chart? Why or why not?
Result Probability
Win: .89
Tie: -.09
Loss: -.25
No, probability is expressed in positive numbers.
When probability is expressed, it should add up to 1.
Simplify the fraction: 2/6
1/3
Cassidi, Mason, Ray, and Lauren are working on a school project together. The table below shows the probability for who will be working on the project at any given time.
What is Ray's probability?
Student Probability
Cassidi: 3/10
Mason: 1/10
Ray: ?
Lauren: 3/10
3/10
How can I get the experimental probability closer to matching the theoretical probability?
Do more experiments/trials. The more experiments you do, the more likely you are to get closer to the theoretical probability.
What is 4/5 written as a percent?
80%
Cassidi, Mason, Ray, and Lauren are working on a school project together. The table below shows the probability for who will be working on the project at any given time.
If it takes 400 minutes to finish the project, what is the best prediction of how many minutes Ray spent on the project?
Student Probability
Cassidi: 3/10
Mason: 1/10
Ray: ?
Lauren: 3/10
120 minutes