Statistics and Probability (IMO Mathematics Olympiad (SOF) Class 9): Questions 64  70 of 101
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Passage
Cards marked with the number 5 to 104 are placed in a box and mixed thoroughly. One card is drawn from this box. Find the probability that the number on the card is
Question number: 64 (2 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
A prime number less than 30.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 65 (3 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
A number less than 21
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 66
» Statistics and Probability
Question
Average of 15 numbers is 45. What should be added as 20^{th} number to make the average 60?
Choices
Choice (4)  Response  

a.  410 

b.  525 

c.  758 

d.  672 

Question number: 67
» Statistics and Probability
Question
One card is drawn from a wellshuffled deck of 52 cards. The probability of neither a heart nor a red king is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 68
» Statistics and Probability
Question
A die is thrown once. The probability of getting an odd number is ________
Choices
Choice (4)  Response  

a.  2 

b. 


c. 


d.  0 

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 
