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, where 0 means the event will not happen and 1 means it will definitely happen.

Front

What is the formula for calculating probability?

Back

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

Front

If a bag contains 4 red and 6 blue marbles, what is the probability of picking a red marble?

Back

Probability = 4/(4+6) = 4/10 = 2/5.

Front

What is the probability of rolling a 3 on a standard six-sided die?

Back

Probability = 1/6, since there is one favorable outcome (rolling a 3) out of six possible outcomes.

Front

What is an even number?

Back

An even number is an integer that is exactly divisible by 2.

Front

What is the probability of rolling an even number on a standard six-sided die?

Back

There are three even numbers (2, 4, 6) out of six possible outcomes, so the probability is 3/6 or 1/2.

Front

What does it mean to flip a coin?

Back

Flipping a coin means tossing it in the air to see which side (heads or tails) lands facing up.

Front

If you flip a coin 10 times, how many times should you expect to get heads?

Back

You should expect to get heads about 5 times, since the probability of heads is 1/2.

Front

What is a sample space in probability?

Back

A sample space is the set of all possible outcomes of a probability experiment.

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

Probability = (6 red + 4 blue) / (2 pink + 6 red + 4 blue) = 10/12 = 5/6.