5-6    Adding Probabilities




1.    What does it mean for two events to be mutually exclusive?    ____________________________________

                                                                                                   _____________________________________
 

2.    Which of the following two are mutually exclusive?  (circle the two)
        A.    sum of the dice is greater than 8
        B.    dice are equal
        C.    dice are both ones
        D.    dice are less than 10
 

3.    If there is a 7/9 chance of rain today, what is the probability it will not rain?   ____________
 

4.    On my last test there were 4 A's, 5 B's, 2 C's, and 2 D's.  What is the
        probability that chosen at random, a person made an A or B?                     ____________
 

5.    In a bag, I have 5 red, 10 blue, 2 green, 3 yellow, and 10 black marbles.

        A.) If drawn at random, what is the probability I will pull out a blue or red marble?   __________

        B.) If drawn at random, what is the probability I will pull out a green or yellow marble?   __________

        C.) If drawn at random, what is the probability I will not pull out a green marble?   __________

        D.) If drawn at random, what is the probability I will not pull out a blue or black marble?   __________

        E.) If drawn at random, what is the probability I will  pull out a purple marble?   __________

        F.) If drawn at random, what is the probability I will not pull out a purple marble?   __________
 

6.    On a spinner, there is a 20% chance the spinner will land on red,  40% chance it will land on green,
       30% chance it will land on black, and 10% chance it will land on pink.

        A.) What is the probability it will land on red or green?  ___________

        B.)  What is the probability it will land on pink or green?  ___________

        C.)  What is the probability it will land on black or red?  ___________

        D.)  What is the probability it will not land on red?  ___________

        E.)  What is the probability it will not land on red or green?  ___________
 
 

 Back to Chapter 5