Probability

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 and 1.

Front

What is the probability of rolling a number less than 3 on a 6-sided die?

Back

1/3

Front

How do you calculate the probability of an event?

Back

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

Front

If the probability of an event A is 0.3, what is the probability of not A?

Back

P(not A) = 1 - P(A) = 0.7 or 70%.

Front

What is the total number of marbles in a bag with 3 red, 4 blue, 2 green, and 6 clear marbles?

Back

Total = 3 + 4 + 2 + 6 = 15 marbles.

Front

What is the probability of drawing a green marble from a bag containing 3 red, 4 blue, 2 green, and 6 clear marbles?

Back

P(green) = 2/15.

Front

What does it mean if an event has a probability of 0?

Back

It means the event is impossible and will not occur.

Front

What does it mean if an event has a probability of 1?

Back

It means the event is certain and will definitely occur.

Front

In Bag A, there are 9 red and 3 green marbles. What is the probability of selecting a green marble?

Back

P(green from Bag A) = 3/12 = 1/4.

Front

In Bag B, there are 9 black and 6 orange marbles. What is the probability of selecting a black marble?

Back

P(black from Bag B) = 9/15 = 3/5.