Theoretical
Maria is flipping a coin. What is the theoretical probability the coin will land on heads?
What is 1/2, 0.5, or 50%?
Layla flipped a coin 10 times and landed on heads 4 times. What is the experimental probability of landing on heads?
What is 2/5, or 0.4, or 40%?
If you flip a coin 10 times, about how many times should it land on heads?
5
Describe the difference between events that are certain, likely, unlikely, or impossible.
Certain would be 100% of the time, likely is anything greater than 50% of the time, unlikely is anything less than 50% of the time, and impossible is anything that has a 0% chance of occuring.
How likely is it that a coin is flipped and lands on tails?
Equally likely
The classic wood carousel at Carousel Park in Hampton, VA has 32 horses and 8 of them are standing horses. What is the probability of randomly selecting a standing horse?
What is 1/4, or 0.25, or 25%?
Jason rolled a die twenty times. He landed on 2 five times, 3 seven times, 6 two times, and 5 six times. What is the experimental probability of landing on 6?
1/10, 0.1, or 10%
You have a spinner with four equal sections that are blue, red, green, and yellow. If you spin it 100 times, about how many times should you land on yellow?
25 times
Define "experimental probability."
The probability of what actually occurs.
How likely is it that a number cube is tossed and lands on 3?
Unlikely
What is the probability of rolling a number greater than 2 with a standard number cube?
What is 2/3, or 0.66, or 66%?
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%
Trent has 30 marbles in a bag. The theoretical probability of choosing a green or blue marble is 1/2. How many marbles are blue or green?
15 blue or green marbles
Define "theoretical probability"
The probability that you expect to happen.
There are 4 red marbles, 3 green marbles, and 1 yellow marble in a box. One marble is taken out of the box. What is the probability that the marble is red or yellow?
What is 5/8, 0.625 or 62.5%?
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%
There are 20 students in Ms. Williams class. The theoretical probability of choosing a female student to answer a question is 40%. How many girls are in the class?
8 girls
What do you call the type of event where more than one event is occurring? (Ex: spinning two dice)
Compound event
Jarrod spins a spinner with 5 equal sections numbered 1-5. What is the probability she will spin and land on a composite number?
What is 1/5 or 0.2, or 20%?
Hasaan has a spinner with 5 equal sections, each a different color. After only 10 spins, the pointer had landed on red 40% of the time. After a whopping 1,000 spins, the pointer landed on red only 22% of the time. How can Hasaan account for this change in experimental probability?
As the number of trials increase, the experimental probability reaches closer to the theoretical probability. (The Law of Large Numbers)
Carley has a 0.2 chance of winning Ms. Williams raffle. If there are 30 tickets in the bucket, how many of the tickets have Carley's name on it?
6
Describe the difference between an independent event and a dependent event.
An independent event is when one event occurs and the item is replaced before the second event occurs (does not affect the next event).
A dependent event is when one event occurs and the item is not replaced before the second event occurs (does affect the next event).
How likely is it that a number cube lands on 2 and a coin lands on heads?
unlikely