Exploring the Probability of Simple Events

Mr. Richards introduces the concept of probability, focusing on simple events and complementary events. The lesson includes vocabulary definitions, real-world examples, and guided examples using dice and coin tosses. The key concept is understanding probability as a ratio of favorable outcomes to possible outcomes, expressed as fractions, decimals, or percentages. Complementary events are explained as events that cannot happen simultaneously, with examples provided to illustrate the concept.

What does probability measure?

• The duration of an event

• The certainty of an event not happening

• The chance that an event will occur

• The number of outcomes in an event

How can probability be expressed?

• Using letters only

• As a percentage over 100%

• Only as a whole number

• As a fraction, decimal, or percent

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

• 6/1

• 1/3

• 1/2

• 1/6

If a coin is tossed, what is the probability of landing on heads?

• 25%

• 50%

• 100%

• 75%

What is the probability of selecting a vowel from a spinner labeled A to J?

• 50%

• 10%

• 20%

• 30%

What does the 'complement' in probability refer to?

• The most favorable outcome

• An event that cannot happen at the same time as another

• An event that is certain to happen

• The total outcome of an event

What is the probability of not rolling a six on a six-sided die?

• 5/6

• 2/3

• 1/2

• 1/6

How is the probability of an event and its complement related?

• Their sum is 1 or 100%

• They have no relation

• They are always equal

• Their product is 1

If a bag contains 5 blue, 8 red, and 7 green marbles, what is the probability of not selecting a red marble?

• 3/5

• 5/20

• 12/20

• 7/20

If 30% of students have blue eyes, what is the probability of a student not having blue eyes?

• 60%

• 40%

• 70%

• 30%