Statistics and Probability (IMO Mathematics Olympiad (SOF) Class 9): Questions 42  48 of 101
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Question number: 42
» Statistics and Probability
Question
The mean, median and mode of the following numbers
12,24,12,23,24,22,25,26,25,26,26,28,25,22,26,28,29,30,11,12 are________
Choices
Choice (4)  Response  

a.  22,26,25 

b.  22.8,25,26 

c.  25,22,25 

d.  26,25,22 

Question number: 43
» Statistics and Probability
Question
Mean of 11 observations is 17.50, if one observation value 15 is deleted. The mean of remaining observations is ________
Choices
Choice (4)  Response  

a.  17.75 

b.  18.75 

c.  15.75 

d.  16.75 

Question number: 44
» Statistics and Probability
Question
If the mean of 10 observations is 20 and that of another 15 observations is 16, then the mean of 25 observations is ________
Choices
Choice (4)  Response  

a.  17.6 

b.  18.2 

c.  17 

d.  18 

Question number: 45
» Statistics and Probability
Question
The King, queen and jack of clubs are removed from a deck of 52 cards and then wellshuffled. One card id selected from the remaining cards. The probability of getting a club is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 46
» 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.  4 

d.  3 

Passage
A car is going on a long journey for 16 hours, starting at 5.00 hrs. The speed of the car at different hours is given below:
Time (in hrs):  5  7  9  11  13  17  15  19  21 
Speed (in km/hour):  40  50  60  80  70  65  75  60  50 
From the above table answer the following questions.
Question number: 47 (1 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of decrease in speed during 19.00 hrs and 21.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 48 (2 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of increase in speed during 9.00 hrs and 11.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

