Theoretical
Maria is 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 of 20%.
You roll a number cube, what are the odds in favor of rolling a 3 or 5?
1 to 2
Define "theoretical probability."
It is the probability of what should occur. {successes/total possibilities}
How many different four-letter permutations can be formed from the letters in the word triangle?
1,680
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
What is the number of possible outcomes for spinning one spinner with 8 equal sections and another spinner with 6 equal sections?
48 possible outcomes
The probability that is based on repeated trials of an experiment.
What is "experimental probability".
How many ways can three cards be selected from a deck of 52 cards (without replacement)?
22,100
I have a pack of Starburst. There are 8 orange, 3 red, and 1 yellow. What is the probability that I pick a red or yellow?
1/3
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%
Amiya and Kyshon are candidates for class president of the 7th grade. Cijae, William, and Ashley are candidates for vice president. How many winning combinations are possible?
6
What does a probability of 1 mean?
The event will occur.
Find the probability of selecting three science books and four math books from eight science books and nine math books.
0.363 or 36.3%
There are 7 red marbles, 2 green marbles, and 1 yellow marble in a box. What are the ODDS that I select a green marble?
1:4
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 or a cardinal? Woodpecker = 3 Chickadee = 5 Cardinal = 1 Sparrow = 13 Blue Jay = 3
6/25, or 0.24, or 24%
Ms. Martinez is packing for a trip. She packs a white blouse, a pink blouse, a blue blouse, and a green blouse. She also packs a black suit, a navy blue suit, and a gray suit. What is the probability that the first outfit she wears is the gray suit with a pink blouse?
1 out of 12
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%)
A basketball team consists of 12 freshmen, 8 sophomores, 9 juniors, and 5 seniors. Four players are selected at random to serve as captains. Find the probability of selecting 2 sophomores and 2 freshmen.
0.0398 or 4%
Jarvonya spins a spinner with 5 equal sections numbered 1-5 and she spins another spinner with 5 equal sections with the letters A-E. What is the probability she will spin a 4 and a vowel?
2/25 or 0.08, or 8%
A deli owner records the following information about his customers: 48 ordered Turkey, 25 ordered Vegetarian, 27 ordered Ham If he sells 20 sandwiches today, about how many of them will be Turkey?
About 10 (9.6 to be exact but you can't sell a piece of a sandwich!)
How many eight-digit numbers (with repetition) can be formed if the leading digit cannot be a zero and the last number cannot be 1?
81,000,000
The possible results of an experiment
What is outcomes.
The sample space of an event is the set of numbers S = {1, 2, 3, 4, 5, 6}.
L = {1, 2, 3, 4} A = {3, 4, 5, 6}
B = {2, 3, 4, 5} Find L U B'
{1, 2, 3, 4, 6}