Introduction to Probability and Word Problems using the Addition Rule

This video tutorial teaches how to calculate probabilities using the addition rule. It explains the difference between disjoint and non-disjoint events, introduces key probability terms and symbols, and provides example problems involving candies, shapes, and holiday meals. The lesson concludes with a summary of the key concepts covered.

What is the formula for calculating the probability of two disjoint events?

• Probability of A union B equals probability of A plus probability of B

• Probability of A union B equals probability of A times probability of B

• Probability of A union B equals probability of A minus probability of B

• Probability of A union B equals probability of A plus probability of B minus probability of their intersection

In probability, what does the word 'or' signify?

• The probability of the intersection of events

• The probability of the union of events

• The probability of mutually exclusive events

• The probability of a single event

Which rule is used to calculate the probability of an intersection in more advanced problems?

• Addition Rule

• Subtraction Rule

• Multiplication Rule

• Division Rule

How do you determine if events are disjoint in a word problem?

• Check if the events have the same probability

• Check if the events are dependent

• Check if the events are independent

• Check if both events can occur at the same time

In a bag of 100 candies, 35 are peppermints and 25 are caramels. What is the probability of picking either a peppermint or a caramel?

• 1/2

• 3/5

• 1/3

• 2/5

What is the probability of selecting a triangle or a blue shape from a bag containing different shapes?

• 11/13

• 4/13

• 8/13

• 7/13

If 42% of families have pie and 34% have cake, with 12% having both, what is the probability of a family having either pie or cake?

• 0.74

• 0.64

• 0.54

• 0.44