Vocabulary
An activity in which results are observed.
an experiment
There are 3 red, 4 green, 2 purple, and 3 orange jelly beans in a bag. What is the probability of picking a jelly bean that is not purple?
5/6
A number cube was rolled 150 times. It landed on 2 21 times. What is the experimental probability of landing on a 2?
21/150 (.14)
The probability of rolling a 3 on a fair number cube.
1/6
In an experiment with a coin and fair die, the probability of landing on heads and 6.
1/12 (.083)
Each observation in an experiment.
a trial
The following marbles are in a bag: 20 red, 25 blue, 15 green, 10 white, and 30 black marbles. What is the probability of picking a red marble?
1/5
The class president made 75 copies of the flyer advertising the school play. It was found that 6 of the copies were defective. What is the probability that a flyer will be printed properly?
6/75 (0.08)
The probability of picking a card with hearts in a deck of cards.
1/4
In an experiment involving a coin and fair die, the probability of landing on tails and an even number.
1/4 (0.25)
The result of a trial.
an outcome
The following marbles are in a bag: 20 red, 25 blue, 15 green, 10 white, and 30 black marbles. What is the probability of picking a black marble?
3/10
The class president made 75 copies of the flyer advertising the school play. It was found that 6 of the copies were defective. If 400 more flyers need to be printed, predict how many will be defective.
32 flyers
Rolling two number cubes, the probability of getting a sum of 10 or more.
1/6 (.167)
Playing Monopoly with two dice, you will "go to jail" if you roll a doubles or total of three on your next roll. The probability that you will go to jail on your next roll.
8/36, 2/9, .222
The set of all possible outcomes in an experiment.
the sample space.
Mrs. Silverstein has 14 boys and 11 girls in her class. She must select one student at random to serve as the class moderator. What is the probability that she will choose a boy? What is the probability that she will choose a girl?
14/25 (.56) and 11/25 (.44)
If a coin is tossed 75 times and it lands on heads 36 times, what is the experimental probability of it landing on tails?
52%
If Sam guessed the day that someone was born in November, what is the theoretical probability that he guessed correctly?
1/30 (.03)
Give the sample space for 2 dice being rolled.
36 outcomes listed
The probability of zero means that the event is __________.
impossible
Based on world statistics, the probability of identical twins is 4/1000, while the probability of fraternal twins is 23/1000. What is the probability that a person chosen at random from the world will be a twin?
27/1000 (0.027)
The likelihood of an event is estimated by repeating an experiment many times and observing the number of times the event happens.
experimental probability
Used to estimate probability by making certain assumptions about an experiment.
theoretical probability
When two events can not occur in the same trial of an experiment.
mutually exclusive events