There are 916 students at Roosevelt High, of whom 155 are seniors. What is the probability that a randomly selected student is a senior?
155/916
17%
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 both 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
10%
What is the probability flipping two coins and getting one heads and one tails?
1/2 x 1/2 = 1/4
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
Draw a spinner that has 12.5% chance of landing on RED.
12.5% is 1 out of 8
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? Justify your thinking.
Technically she is wrong.
The experimental probability is not always the same as theoretical or actual probability.
THE REAL PROBABLITY of the next flip IS STILL 50% or 1/2
What is the probability of flipping ten coins and getting the same outcome each time?
1/1024
.098%
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
DRAW a spinner and write a probability problem that would have an answer 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: