Vocabulary
An activity involving chance in which results are observed.
Experiment
As likely as not
Tossing a coin.
H, T
Jenny rolled a number cube 20 times and here are the results:
1-5 times, 2- 3 times, 3- 5 times, 4- 4 times, 5- 2 times, 6- 1 times
Experimental probability of rolling a 4
4/20 = 1/5
A bowler knocks down at least 6 pins 70 percent of the time. Out of 200 rolls, how many times can you predict the bowler will knock down at least 6 pins?
140 times
The repetition of an experiment.
Trial
Rolling a number cube and landing on a 7.
Impossible
A spinner divided into 6 equal sections, numbered 1-6.
1, 2, 3, 4, 5, 6
Flipping a coin 50 times with the following results:
Heads- 24 times
Tails- 26 times
P(heads)
24/50 = 12/25
Jaime took a sample of video game owners to see how many own a driving game.
Sample size: 80
Number owning a driving game: 24
Population: 340
Set up the proportion that you would use to solve this.
24/80 = x/340
The result of a trial.
Outcome
Unlikely
Shirts in colors red and green and sizes small, medium and large.
SR, MR, LR, SG, MG, LG
There are shirts available in 3 sizes (small, medium, large) and 4 colors (red, blue, purple, green). Guests at an awards ceremony received shirts as a prize. The following shirt combinations were given out.
SR-25, SB-10, SP-15, SG-30
MR-20, MB-12, MP-20, MG-10
LR-15, LB-18, LP-17, LG- 20
What is the experimental probability that the next shirt will be a medium red.
20/212 = 5/53
West Palm Beach, Florida, gets rain about 16 percent of the time. On how many days out of 400 can residents of West Palm Beach predict they will get rain?
64 days
The set of all possible outcomes for an experiment.
Sample Space
Spinning a spinner divided in 4 colors, evenly, and landing on a color.
Certain
Ice cream flavors of vanilla, chocolate and strawberry with toppings of whipped cream, fudge and cherry.
VW, VF, VC, CW, CF, CC, SW, SF, SC
Flipping a coin and spinning a spinner divided with red, blue and green equal sections 50 times.
Results:
HR- 12, HB- 10, HG- 5, TR- 10, TB- 15, TG- 9
P(Heads and Blue)
10/50 = 1/5
In the school lunch line, 65 of the last 80 students have gotten water with lunch. Based on the sample, how many students will get water if the whole school has 400 students?
325 students
Found by comparing the number of times an event occurs to the total number of trials
Experimental Probability
Rolling a number cube and flipping a coin and landing on Heads and 2.
Unlikely
The total number of outcomes in the sample space of 3 colors and 5 shapes
15 outcomes
The best baseball team ever..
Chicago Cubs
A basketball player makes 80% of free throws she attempts. She attempts 225 free throws in practice. How many free throws would you predict her to make?
180 free throws