8.PS.1 Unit Flashcard

Front

What is probability?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 and 1.

Front

What is the formula for calculating the probability of an event?

Back

Probability (P) = Number of favorable outcomes / Total number of possible outcomes.

Front

If a bag contains 6 lollipops and 4 gumballs, what is the probability of drawing a lollipop?

Back

P(lollipop) = 6 / (6 + 4) = 6/10 = 3/5.

Front

What is the probability of drawing a gumball from the same bag?

Back

P(gumball) = 4 / (6 + 4) = 4/10 = 2/5.

Front

What is the probability of rolling a number greater than 4 on a number cube?

Back

P(number > 4) = 2/6 = 1/3 (numbers 5 and 6 are greater than 4).

Front

What is the probability of tossing tails with a fair coin?

Back

P(tails) = 1/2.

Front

What is the combined probability of two independent events occurring?

Back

P(A and B) = P(A) * P(B).

Front

If a coin is flipped and a die is rolled, what is the probability of getting heads and a 6?

Back

P(heads and 6) = P(heads) * P(6) = (1/2) * (1/6) = 1/12.

Front

What is the probability of drawing a red marble first from a bag of 5 red and 3 blue marbles?

Back

P(red first) = 5 / (5 + 3) = 5/8.

Front

What is the probability of drawing a blue marble second if a red marble was drawn first?

Back

P(blue second) = 3 / (4 + 3) = 3/7 (after drawing one red marble).