9-4   Multiplying Probabilities



1.    What does P(rain) mean?  __________________________________________________________
 

2.    If I have a 90% chance of getting a dog this week and a 50% chance my wife will cook me a steak
       this evening, what is the probability I will get a dog this weekend and my lovely wife will cook fix
       me a steak?

                            _________________
 

3.    If you have a 2/5 chance of beating Mr. Kwasny in chess and a 5/8 chance of beating Mr. Knight,
       what is the probability you will be able to beat them both?

                            _________________
 

4.    If I have a 10% chance of beating Mr. Knight in basketball and a 90% chance of beating him in tennis,
       what is the probability I will beat him in both?

                            _________________
 

5.    What is the probability you will flip a fair coin and have it land on heads

        a.) two time in a row?    ____________

        b.) three times in a row?    ___________

        c.) five times in a row?    ____________

        d.) eight times in a row?  ____________

        e.) ten times in a row?  _____________
 

6.    Assume I am 99% accurate with my math facts.

        a.)  What is the probability I will get all 10 questions on a math quiz correct?  _____________

        b.)  What is the probability I will get all 20 questions on a math quiz correct?  _____________

        c.)  What is the probability I will get 100 questions in a row correct?  ______________

        d.)  What is the probability I will get 500 questions in a row correct?  ______________
 

Back to Chapter 9