Probability 7th Grade Math

Front

What is probability?

Back

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

Front

How do you calculate the probability of an event?

Back

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

Front

What is a favorable outcome in probability?

Back

A favorable outcome is the result of an event that we are interested in.

Front

What is the total number of outcomes?

Back

The total number of outcomes is the sum of all possible results of an experiment.

Front

If a bag contains 2 silver coins, 2 gold coins, 6 copper coins, and 5 brass coins, what is the total number of coins?

Back

Total coins = 2 + 2 + 6 + 5 = 15 coins.

Front

In a probability experiment, if you have 10 red tiles and 15 blue tiles, what is the probability of drawing a red tile?

Back

Probability of red tile = 10 / (10 + 15) = 10/25 = 2/5.

Front

What is the expected value in probability?

Back

The expected value is the average outcome of a probability experiment if it were repeated many times.

Front

If you have a bag of 40 jelly beans with 5 black jelly beans, what is the probability of picking a black jelly bean?

Back

Probability of black jelly bean = 5 / 40 = 1/8.

Front

How do you predict outcomes based on ratios?

Back

To predict outcomes, use the ratio of favorable outcomes to total outcomes and apply it to the new total.

Front

What is a sample space in probability?

Back

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