Simple Probability 7th grade

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 occur and 1 means it will certainly occur.

Front

What is the formula for calculating probability?

Back

The probability of an event is calculated using the formula: P(Event) = (Number of favorable outcomes) / (Total number of outcomes).

Front

What is the probability of pulling a red marble out of a jar with 10 green, 7 red, and 3 blue marbles?

Back

P(Red) = 7 / (10 + 7 + 3) = 7 / 20 = 0.35 or 35%.

Front

What is the probability of selecting a brown M&M from a bowl with 4 yellow, 6 orange, 2 brown, 3 green, and 5 blue M&Ms?

Back

P(Brown) = 2 / (4 + 6 + 2 + 3 + 5) = 2 / 20 = 1/10.

Front

What is the range of probability values?

Back

Probability values range from 0 to 1.

Front

What does a probability of 0 mean?

Back

A probability of 0 means that the event cannot occur.

Front

What does a probability of 1 mean?

Back

A probability of 1 means that the event will certainly occur.

Front

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

Back

P(Even) = 3 (even numbers: 2, 4, 6) / 6 = 1/2.

Front

If a spinner is divided into 4 equal sections (red, blue, green, yellow), what is the probability of landing on green?

Back

P(Green) = 1 / 4 = 0.25 or 25%.

Front

What is the probability of drawing a heart from a standard deck of cards?

Back

P(Heart) = 13 (hearts) / 52 (total cards) = 1/4.