Math 7 (Theoretical Probability)

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What is Theoretical Probability?

Back

Theoretical Probability is the likelihood of an event happening based on all possible outcomes, calculated as the number of favorable outcomes divided by the total number of outcomes.

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How do you calculate the probability of an event?

Back

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

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What is the probability of rolling an odd number on a standard die?

Back

The probability of rolling an odd number (1, 3, or 5) is 3/6 or 1/2.

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If a bag contains 2 red, 3 green, and 1 blue marble, what is the probability of drawing a green marble?

Back

The probability of drawing a green marble is 3/6 or 1/2.

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What is the probability of drawing a red or blue marble from the same bag?

Back

The probability of drawing a red or blue marble is (2 red + 1 blue) / 6 total = 3/6 or 1/2.

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What is the probability of getting a head when flipping a coin?

Back

The probability of getting a head is 1/2.

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What is the probability of rolling a number greater than 4 on a standard die?

Back

The probability of rolling a number greater than 4 (5 or 6) is 2/6 or 1/3.

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If a spinner is divided into 4 equal sections (Red, Blue, Green, Yellow), what is the probability of landing on Red or Blue?

Back

The probability of landing on Red or Blue is 2/4 or 1/2.

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What is the probability of drawing a yellow pop from a selection of 8 pops (3 yellow, 2 blue, 3 red)?

Back

The probability of drawing a yellow pop is 3/8.

Front

What is the probability of selecting a Snickers or Kit Kat from a box containing 3 Snickers, 2 Kit Kats, and 5 other candies?

Back

The probability of selecting a Snickers or Kit Kat is (3 + 2) / 10 = 5/10 or 1/2.