Simple Probability
What is P(heads) when you flip a coin?
1/2 or 50% or 0.5
A coin is flipped 20 times and lands on heads 12 and tails 8. What is the experimental probability of landing on tails?
8/20 or 2/5
You flip and coin 2 times. What is the probability of landing on heads and then tails?
1/4
There are 3 sizes of pizzas and 2 types of crust. How many different outcomes are there?
6
True or false: Sample size is a list of all the possible outcomes
True
There are 2 blue marbles, 5 green marbles, and 3 yellow marbles. What is the probability of choosing a blue marble? Simplify your answer.
1/5
Mrs. Arledge rolled a number cube 50 times. She landed on a "1" 8 times, a "2" 11 times, a "3" 7 times, a "4" 10 times, a "5" 9 times, and a "6" 5 times. What is the relative frequency of Mrs. Arledge landing on a "1" or a "3". Write your answer as a percent.
30%
You roll a 6-sided die 3 times. What is the probability of landing on a "2" all 3 times?
1/216
Mrs. Strawser has 5 pair of pants, 4 sweaters, and 3 pair of shoes to choose from. How many outfit combinations are there?
60 combinations
What is experimental probability (or relative frequency)?
The number of outcomes that occurred during the experiment over the total possible outcomes.
There are 4 blue, 2 green, 4 yellow, and 5 red marbles. What is the probability of choosing a green or red marble?
7/15
Mrs. Arledge interviewed 100 students about their favorite sport. The results were 39 football, 18 basketball, 22 baseball or softball, 10 volleyball, 11 soccer. What is the relative frequency of a student choosing either volleyball or basketball? Simplify your answer.
7/25
You have 10 marbles. 2 are blue, 3 are red, 1 is yellow, and 4 are green. You choose a marble, keep it out and then choose a second marble. What is the probability that you will choose a blue and then a red marble? Simplify your answer.
1/15
An icecream shop has 3 sizes of cones and 15 flavors of icecream. They decide to add 2 more flavors of icecream. How many more combinations were added when they added the 2 new flavors?
6 more combinations
If an event has 0% chance of occurring it is ______?
If an event has a 100% chance of occurring it is______?
impossible, certain