Probability
Maria is flipping a coin and spinning a spinner. The spinner has 4 equal sections labeled A-D. What is the probability the coin will land on heads and the spinner will land on the letter "A"?
1/8 or 0.125, or 12.5%
Which of the following is a random sample of students at your school?
a. 10 girls
b. 10 of your friends
c. 10 people you know
d. 10 names picked from a hat
d. 10 names picked from a hat
You are trying to decide what to wear to school. You know you have a green pair of pants, a red pair, and a blue pair. You also have a brown shirt, a plaid shirt, and a yellow shirt. How many different outfit combinations can you make?
9
What is the list of all possible outcomes?
Sample space
The classic wood carousel at Carousel Park in Hampton, VA has 32 jumping horses and 16 standing horses. What is the probability of randomly selecting a jumping horse?
1/2, or 0.50, or 50%
Which of the following is a biased sample of the houses in you neighborhood?
a. 20 houses generated randomly by a computer program
b. 20 houses randomly selected that have newspapers delivered
c. 20 houses randomly selected from a map of the neighborhood
a. 20 houses generated randomly by a computer program
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
How do we find the total in a relative frequency problem?
Add all of the frequencies together.
Some students are taking surveys to find out if people will vote to fund the building of a new city park on election day. Which student is taking the most representative sample?
a. Ella asks 20 parents of her friends.
b. Anna asks every other person leaving the library until he has asked 20 people.
c. Cooper calls 20 randomly selected registered voters.
d. Jordan sends e-mails to 20 friends.
c. Cooper calls 20 randomly selected registered voters.
Gia and Nathen are candidates for class president of the 7th grade. Hussena, John, and Grayson are candidates for vice president. How many winning combinations are possible?
6
What can we draw that helps us figure out all of the possible outcomes?
Tree diagram
There are 3 red marbles, 2 green marbles, and 1 yellow marble in a box. One marble is taken out and not replaces. A second marble is then taken out and not replaced. What is the probability both marbles that were taken out are red?
1/5, or 0.20, or 20%
For each situation, tell whether the situation is unlikely, likely, or neither likely nor unlikely.
a. Drawing a 10 from a bag with 100 slips of paper numbered 1-100.
b. Rolling a number less than 5 on a number cube labeled with the numbers 1-6.
c. Drawing a red marble from a bag containing 8 red and 8 blue marbles.
a. unlikely
b. likely
c. neither likely nor unlikely
At Chipotle, there are 2 container options (bowl or burrito), 4 meat options, and 3 salsa options. How many order combinations are there?
24 combinations
Emma 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 B?
1/25 or 0.04, or 4%
What makes a sample unbiased? (List three)
Randomly selected, large enough, people from many groups
What is the probability of rolling three 4's in a row on a number cube?
1/216
Define "dependent event."
When one event occurs and that item is not replaced before the second event occurs.