Probability and Statistics

Pre-Test

1.         Probability is the study of ....

a.    What is certain to happen
b.    Gambling
c.     What is most likely to happen
d.    all of the above

2.         How many ways can you re-arrange the letters of the word, "DOG"

a.   12
b.   9
c.    6
d.    3

3.         The best method to use when figuring the combinations of #2 is

a.   counting principle
b.   make a list
c.    both of these
d.   none of these

4.         When rolling one die in a pair of dice,the chances of rolling a 3 are

a.   one in 3
b.   one in 6
c.   one in 9
d.   one in 12

5.        Your e-mail has a password that is all numbers. You remember the first number. if you were going to guess at the other two, how many possible combinations would there be?

a.    1000
b.    100
c.    10
d.    0

6.         You are on a school field trip and the bus is stopping at a fast food restaurant. Your sponsor tells you that you can order either a chicken sandwich or a cheeseburger. You can also choose between french fries, onion rings, or a cherry pie. You want to figure out how many meal combinations there are. The best way to do this is by using a

a.    tree diagram
b.    list
c.    the counting principle
d.    a calculator

7.         Which of these best describes the counting principle?

a.     A diagram which outlines all of the choices
b.    the total number of possible combinations is the produt of the number of items in each set
c.     The principal where you make a list and count the numbers
d.     none of these

8.        How many combinations are there on a combination lock with 40 numbers (including zero)?

a.    40,000
b.    640
c.    400
d.    64,000

9. If a combination lock had 40 letters instead of 40 numbers would it have

a. more combinations

b. less combinations

c. the same number of combinations

d. dividend, divisor and sum

10. Once you make a tree diagram, you can determine the total number of possible combinations by

a. counting the number of branches at the lowest level

b.taking the sum of all the branches at all levels

c. multiplying the number of branches times the number of branches

d. all of the above