Probability Flashcard

Front

What is probability?

Back

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

Front

What is the probability of an event that is certain?

Back

The probability of a certain event is 1.

Front

What is the probability of an impossible event?

Back

The probability of an impossible event is 0.

Front

How do you calculate the probability of an event?

Back

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

Front

If there are 8 pencils in a box, 2 are red. What is the probability of picking a red pencil?

Back

0.25 or 25%.

Front

If you have a bag with 1 red marble and 9 blue marbles, what is the probability of picking a red marble?

Back

Unlikely.

Front

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

Back

50% or 0.5.

Front

If there are 4 apples and 6 bananas in a fruit bowl, what is the probability of picking an apple?

Back

40% or 0.4.

Front

What does 'likely' mean in terms of probability?

Back

'Likely' means that an event has a high chance of occurring, but it is not guaranteed.

Front

What does 'unlikely' mean in terms of probability?

Back

'Unlikely' means that an event has a low chance of occurring.