Complementary Events

Edy plants a daffodil bulb. The chance that the bulb will grow is 0.8. What is the chance that the bulb will not grow?

• 0.2

• 0.4

• 0.6

• 0.8

Leon throw a biased coin. If the probability of getting heads is 0.4

What is the probability of getting tails?

• 0.2

• 0.4

• 0.6

• 0.8

The complement of rolling a 3 is:

• Rolling an odd number

• Not rolling a 3

• Rolling an even number

What is the complement to: rolling an even number

• Not rolling an even number (rolling an odd number)

• rolling a 2,4,6

• Rolling a number less than 4

• Not possible

If there is a 70% chance of rain, what is the probability that it will NOT rain?

(a)  

What do the probabilities of complementary events add up to?

(a)  

Pr⁡(A) + Pr⁡(A′) = 1

• True

• False

A clothing store sells shirts, pants, and jackets. What's the complement of randomly selecting an item that is a jacket?

• Selecting a shirt or a jacket

• Not selecting pants

• Not selecting a jacket

• Selecting a jacket

What is the complement of Rolling a 5 on a dice?

• Rolling a 6

• Rolling an even number

• Not rolling a 5

• Not rolling an odd number