Simple Probability

Front

What is the definition of probability?

Back

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

Front

What is the probability of rolling a 7 on a single six-sided die?

Back

0, because a standard die has only the numbers 1 through 6.

Front

How do you calculate the probability of an event?

Back

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

Front

In a jar with 2 pink, 6 red, and 4 blue marbles, what is the probability of picking a red or blue marble?

Back

5/6, because there are 6 red and 4 blue marbles, totaling 10 favorable outcomes out of 12 total marbles.

Front

What is the probability of spinning an even number on a spinner divided into 4 equal sections numbered 1 to 4?

Back

50%, because there are 2 even numbers (2 and 4) out of 4 total sections.

Front

If Mrs. Elder has 6 crackers, 3 peppermints, 6 bubble gums, and 3 licorice sticks, what is the probability of choosing a cracker or a peppermint?

Back

1/2, because there are 9 favorable outcomes (6 crackers + 3 peppermints) out of 18 total pieces.

Front

What is the probability of selecting a pink marble from a bag containing 23 marbles of different colors?

Back

1/23, because there is 1 pink marble out of 23 total marbles.

Front

What is the complement of an event in probability?

Back

The complement of an event is the probability that the event does not occur, calculated as 1 minus the probability of the event.

Front

What is an example of a simple event in probability?

Back

Rolling a die and getting a specific number, such as a 3.

Front

What is the difference between independent and dependent events?

Back

Independent events are those whose outcomes do not affect each other, while dependent events are those where the outcome of one event affects the outcome of another.