Theoretical
Maria spinning a spinner. The spinner has 4 equal sections labeled A-D. What is the probability the spinner will land on the letter "A"?
1/4 or 25%
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.
You are trying to decide what to wear to school. You know you have a green pair of pants, a red pair, and a blue pair. You also have a brown shirt, a plaid shirt, and a yellow shirt. How many different outfit combinations can you make?
9
Define "theoretical probability."
It is the probability of what should occur.
How likely is it that a coin is flipped and lands on tails?
Equally likely
A bag of marbles has 3 red marbles, 5 black marbles, and 2 white marbles. What is the probability of pulling out a red marble?
3/10 or 30%
Ms. Catalano has a non-uniform spinner where red is 1/2 the spinner, blue is 1/4, and black is 1/4. After 500 spins, about how many times would you expect red to show up?
250 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
I have a pack of Starburst. There are 8 orange, 3 red, and 1 yellow. What is the probability that I pick a yellow one, eat it, then select an orange one?
2/33
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%
What does it mean if an event is certain? Give an example of a certain event.
It will occur, 100% likely I will die.
How likely is it that a number cube labeled 1-6 is tossed and it lands on 8?
impossible
There are 7 red marbles, 2 green marbles, and 1 yellow marble in a box. What is the probability that I select a green marble, eat it, then select another green marble?
Who eats a marble???
Fine, 1/45
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%
What does it mean if an event is unlikely? Give an example.
Less than 50% chance of it happening. I roll a 5 on a dice (1/6 or 16.6%)
How likely is it that a number cube is tossed and lands on any number 1-6?
Certain
Jarvonya spins a spinner with 5 equal sections numbered 1-5 and she spins another spinner with 8 equal sections with the letters A-H. What is the probability she will spin a prime number and a vowel?
3/20; .15; or 15%
A deli owner records the following information about his customers: 48 ordered Turkey 25 ordered Vegetarian 27 orded Ham If he sells 20 sandwiches today about how many of them will be Turkey?
About 10
What does it mean when the probability of an event is "dependent"? (Do not use a variation of the word "dependent" in your definition.)
The probability of an event is affected by the probability of another event.
How likely is it that a number cube lands on 2 and a coin lands on heads?
unlikely