Question

the probability of a spinner stopping on 5 is 1/9 . the probability of the spinner stopping on 6 is 4/9 . what is the probability of the spinner stopping on 5 or 6?

a. 4/9


b. 4/81


c. 5/9


d. 5/18

Answer 1

1/9 + 4/9 = 5/9...answer C

Answer 2

The events 'stop on 5' and 'stop on 6' are mutually exclusive. Therefore we add the probabilities of each event to find P(5 or 6):
P(5 or 6) = 1/9 + 4/9 = 5/9.
The correct answer is c.