Statistics and Probability (IMO Mathematics Olympiad Class 9): Questions 69  70 of 101
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Question number: 69
» Statistics and Probability
Question
The probability of guessing the correct answer to a certain test question is. If the probability of not guessing the correct answer to this question is , then x = ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  5 

Question number: 70
» Statistics and Probability
Question
The owner of a plant nursery wanted to test the effectiveness of a new type of fertilizer. He measured the heights of 5 plants, and then gave each an equal amount of fertilizer. Two weeks later, he measured the heights of the plants again. The graph shows the height of the plants before and after the addition of fertilizer.
What was mean growth of the plants, to the nearest tenth of a centimeter?
Choices
Choice (4)  Response  

a.  4.5 cm 

b.  6 cm 

c.  5.5 cm 

d.  5 cm 
