Statistics and Probability (IMO Mathematics Olympiad Class 9): Questions 42  47 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. 

