There are 916 students at Roosevelt, of whom 155 are seniors. What is the probability that a randomly selected student is a senior?
155/916
What is the probability of a coin landing on heads?
1/2
I flip a coin and then spin a spinner. Are these two events independent or dependent?
Independent
In the diagram below, how many people like pancakes AND eggs?
30
What is the probability that a randomly selected person likes skateboards and snowmobiles?
80/160 or 1/2
A medical practice has 18 female doctors and 2 male doctors. What is the probability that a randomly selected doctor is male?
2/20 or 1/10
What is the probability flipping two coins and getting one heads and one tails?
2/4 or 1/2
There are red and green marbles in a bag. I pick out one marble, put it aside, and then pick out a second marble. Are the two events independent or dependent?
Dependent
In the Venn Diagram below, how many people like eggs?
30 + 40 = 70
What is the probability that a randomly selected person does not like snowmobiles or skateboards?
10/160 or 1/16
Write an example of an event with a probability of 1.
Anything CERTAIN to happen
What is the probability of flipping three coins and each one landing on heads?
1/8
Write an example of two INDEPENDENT events.
Any two events with no relationship between each other.
In the diagram below, how many people like pancakes OR eggs?
20 + 30 + 40 = 90
What is the probability of selecting someone that does not like skateboards GIVEN THAT they do like snowmobiles?
25/105 or 5/21
Dani flips a coin 10 times and gets 7 heads. She says the probability of getting a head on the next flip is 70%. Is the right or wrong? Why?
What is the probability of flipping ten coins and getting the same outcome each time?
2/1024 or 1/512
Write an example of two DEPENDENT events.
Any two events where the outcome is unrelated to the outcome of the other.
What is the probability that a randomly selected person likes pancakes?
50/100 or 1/2
What is the probability of someone liking snowmobiles GIVEN THAT they also like skateboards?
80/125 or 4/5
Write an example of an event with a probability of 0.
Anything that's IMPOSSIBLE.
Write an algebraic function for the probability of flipping a coin n times and getting heads each time.
(1/2)^n
The amount of ice cream sold in a day and the number of people who drown on that same day are DEPENDENT events. Explain why.
They both happen more often in hot weather.
What is the probability that a randomly selected person does not like eggs GIVEN THAT they do like pancakes?
20/50 or 2/5
Draw a Venn Diagram representing the data in the table below: