Basic Probability
Maria is flipping a coin. What is the probability as a percent of the coin landing on heads?
50%
Dave has a spinner with 5 equal sections, each a different color. After only 10 spins, the pointer had landed on red 4 times. If he spins the spinner 100 times, what is the probability of it landing on red based on the 10 spins he did as a percent?
40%
You and your friend are deciding if you should go to the movies or go to the mall. You decide to flip a coin 10 times and say that if it lands on heads 6 times out of the 10, you go to the movies, and if it lands on tails 6 times out of the 10, you go to the mall. What is the probability as a percent of the coin landing on tails?
50%
Define "probability."
The chance of an event happening.
Abby spins a spinner with 4 equal sections labeled A-D. What is the probability he will land on a letter in his name? Express your answer as a fraction in simplest form.
1/2
What is the probability as a fraction in simplest form of taking a blue marble out of a bag of 3 blue marbles, 4 green marbles and 8 red marbles?
1/5
A spinner has equal sections labeled numbers 1-12. What is the probability of the spinner landing on a multiple of 3 as a fraction in simplest form?
1/3
What does it mean when a probability is certain to happen?
An event will 100% happen
How likely is it that a six-sided die is tossed and lands on 3?
Unlikely
What is the probability of rolling a prime number on a 6-sided die? Express your answer as a fraction in simplest form.
3/6 = 1/2
A letter tile is randomly selected from a bag, recorded, and replaced 100 times. The results are listed below. What is the probability of selecting the letter "E" as a fraction?
A = 16 E = 11 I = 29 O = 19 U = 25
11/100
A bag of skittles has 8 red, 9 green, 10 yellow, 6 orange and 11 purple. What is the probability as a percent of reaching into the bag and pulling out a purple skittle?
25%
What does it mean when an event is impossible?
It will never happen.
How likely is it that a six-sided die is tossed and it lands on 8?
Impossible
There are 3 red marbles, 5 green marbles, and 2 yellow marble in a box. What is the probability as a percent of getting a red marble?
30%
Pedro recorded the types of birds that visit his bird feeder. Based on the results below, what is the probability as a fraction in simplest form the next bird will be a chickadee?
Woodpecker = 3 Chickadee = 5 Cardinal = 1 Sparrow = 13 Blue Jay = 3
1/5
Mrs. Brown asked her 2nd period class how many students like vanilla ice cream or chocolate ice cream. 16 of her students like vanilla ice cream and 8 of her students like chocolate ice cream. Based on these results, how many students can Mrs. Brown predict will choose vanilla ice cream in her 3rd period class? (Her 3rd period class has 30 students)
20 students will chose vanilla
What probability is used when an event is equally likely to happen?
50% or 1/2
How likely is it that a six-sided die is tossed and lands on any number 1-6?
Certain
Erica spins a spinner with 5 equal sections numbered 1-5. If she spins the spinner 50 times, how many times will she get a 4?
10 times
A six-sided die is thrown 4 times. How many times will an even number be rolled?
2 times
What is the probability as a percent of rolling an 8-sided die numbered 1-8 and it landing on a multiple of 4?
25%
Describe the difference in the probability (as percentages) between events that are certain, likely, equally likely, unlikely, or never going to happen.
Certain would be 100% of the time, likely is anything greater than 50% of the time, equally likely is exactly 50% of the time, unlikely is anything less than 50% of the time, and never is anything that has a 0% chance of occuring.
How likely is it that a six-sided die lands on 2 and a coin lands on heads?
Unlikely