Basic Probability Flashcard

Front

Probability can be expressed as a number between _____ and _____?

Back

0 and 1

Front

Probability can be written as ...

Back

all of the above

Front

What is the sum of the different probabilities for a given event like flipping a coin or rolling a die?

Back

100%

Answer explanation

The sum of all the outcomes of an event MUST be 100%, because one of the possibilities must occur.

For example, when flipping a coin, heads is 50% likely and tails is 50% likely. 50% + 50% = 100%, which makes sense - when you flip the coin, one of those two things MUST happen.

Front

What is the probability of spinning the spinner and landing on the 7?

Back

1 out of 8

Front

What is the probability of spinning an odd number?

Back

1 out of 2

Answer explanation

There are 3 odd numbers and 6 numbers total. So, the probability of spinning an odd numbers is 3 out of 6, which is the same as 1 out of 2.

Front

An event with a probability of 100% is:

Back

certain to happen

Answer explanation

If something happens with 100% probability, it is CERTAIN to happen. For example, if you throw a ball in the air, the probability that it will land is 100%.

Front

What is the probability of rolling a die and having it land as a six?

Back

1/6

Answer explanation

'Die' is the singular of 'dice,' but for some reason, 'mie' is not the singular of 'mice.'

Front

The probability of it raining today is 30%. What is the probability that it will NOT rain?

Back

70%

Front

A bag has 4 green marbles, 3 red marbles, 2 blue marbles, and one yellow marble. If you select one marble at random, what are the chances that it is blue?

Back

2/10

Answer explanation

There are 2 blue marbles, and 10 total marbles. So, the probability of selecting a blue one is 2 out of 10.

Front

What is the probability of spinning green or blue?

Back

1/2

Answer explanation

There are 6 green or blue spaces on the spinner, and 12 total spaces. So, the probability of spinning green or blue is 6 out of 12, or 1 out of 2.