Probability Flashcards

Grade 7 · Math · Flashcards

Key vocabulary and concepts for understanding probability in 7th grade math.

Flashcards

Probability: A number from 0 to 1 measuring how likely an event is; 0 = impossible, 1 = certain
Theoretical probability formula: P(event) = number of favorable outcomes ÷ total number of possible outcomes
Experimental probability formula: P(event) = number of times event occurred ÷ total number of trials
Sample space: The complete list of all possible outcomes; e.g., rolling a die: {1, 2, 3, 4, 5, 6}
Favorable outcome: An outcome that matches the event you are calculating probability for
Complement: P(not A) = 1 − P(A); the probability the event does NOT occur
Law of Large Numbers: As the number of trials increases, experimental probability approaches theoretical probability
Equally likely outcomes: Outcomes that each have the same chance of occurring, like each face of a fair die
Event: Any specific outcome or set of outcomes you are interested in within a probability experiment