WASHINGTON STATE MATHEMATICS COUNCIL

2000 MIDDLE SCHOOL MATH OLYMPIAD

 

Session II:

FIFTH GRADE PROBABILITY & STATISTICS

5

 

1.    What is the probability of drawing one marble which is either red or blue from a bag containing 3 red, 2 blue, and 5 yellow marbles?

 

 

 

 

 

 

2.    Find the sum of the mean and mode of the following math test scores:

      85, 81, 95, 90, 75, 76, 81, 100, 85, 75, 81

 

 

 

 

 

 

3.    What is the probability of rolling a sum of 11 with 2 fair six-sided dice?

 

 

 

 

 

 

4.    I scored 85 and 88 on my first 2 math tests. It takes an average of 90 or better to get an A for the course. I have only one more test to take. What is the least score I need on that test to get an A for the course?

 

 

 

 

 

 

5.    Mrs. Andrews chooses from six people to sit in a row of 4 chairs. How many different ways can she choose? (How many different ways can she sit the 6 people in the 4 chairs?)