The video tutorial explains how to calculate probabilities using the addition rule. It begins with an introduction to the concept and the formula, which states that the probability of A or B is the sum of the probabilities of A and B minus their intersection. The tutorial includes examples, such as finding the probability of a plant being both red and yellow, and a word problem involving cat coat patterns. The lesson emphasizes working backwards to find unknown probabilities using given data and algebraic manipulation.

What is the probability of picking a plant that is either red or yellow?

• 0.64

• 0.48

• 0.82

• 0.30

Which formula represents the addition rule for probabilities?

• P(A and B) = P(A) + P(B)

• P(A or B) = P(A) + P(B) - P(A and B)

• P(A or B) = P(A) - P(B)

• P(A and B) = P(A) - P(B)

If P(A or B) is 0.68, P(A) is 0.31, and P(A and B) is 0.27, what is P(B)?

• 0.27

• 0.68

• 0.40

• 0.64

In the cat coat problem, what is the probability of a cat having a striped coat?

• 0.16

• 0.07

• 0.41

• 0.32

What is the probability of a cat's coat being either spotted or striped?

• 0.41

• 0.32

• 0.16

• 0.07

How do you calculate the probability of a cat's coat having spots using the addition rule?

• Subtract the intersection from the union

• Subtract the probability of striped from the union

• Add the probability of spotted and striped

• Add the probability of striped to the intersection

What is the probability of a cat's coat having spots?

• 0.41

• 0.32

• 0.16

• 0.07

In the flower example, what is the probability of picking a plant that is both red and yellow?

• 0.48

• 0.64

• 0.82

• 0.30

What is the probability of picking a red plant in the flower example?

• 0.82

• 0.30

• 0.48

• 0.64

What is the probability of picking a yellow plant in the flower example?

• 0.82

• 0.30

• 0.48

• 0.64