Simple Probability

Define probability.

• Probability is a measure of the likelihood that an event will occur.

• Probability is the certainty that an event will not occur.

• Probability is the ratio of favorable outcomes to total outcomes.

• Probability is a method of predicting future events.

What is the probability of choosing either a black or white marble from a bag if the probability is 3/5?

• 1/2

• 2/5

• 3/5

• 4/5

What is the probability of an event that is impossible?

• 0.5

• 1

• 0

• 0.25

If an event is unlikely, what is its probability range?

• Between 0 and 0.5

• Between 0.5 and 1

• Exactly 0

• Between 0 and 1

What is the probability of rolling a 3 on a standard six-sided die?

• 1/6

• 1/3

• 1/4

• 1/2

An event has a 100% chance of happening. This event is ___?

• Possible

• Unlikely

• Certain

• Improbable

If you have a bag with 5 red marbles and 5 blue marbles, what is the probability of picking a red marble?

• 1/4

• 1/3

• 1/2

• 2/5

What does it mean if an event is certain?

• It means the event will definitely happen, with a probability of 1.

• It means the event is likely to happen, with a probability of 0.5.

• It means the event may happen, but is not guaranteed.

• It means the event will not happen, with a probability of 0.

How do you calculate the probability of a single event?

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

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

• Probability = (Number of unfavorable outcomes) / (Total number of outcomes).

• Probability = (Number of favorable outcomes) + (Total number of outcomes).

What is the probability of landing on blue in a spinner with 4 sections: 1 red, 1 blue, 1 green, 1 yellow?

• 1/2

• 1/3

• 1/4

• 1/5