Statistics and Probability (IMO Mathematics Olympiad (SOF) Class 9): Questions 16  23 of 101
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Passage
One card id drawn from a wellshuffled deck of 52 cards. Find the probability of drawing
Question number: 16 (4 of 4 Based on Passage) Show Passage
» Statistics and Probability
Question
‘10’ of a black suit
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 17
» Statistics and Probability
Question
Mean marks scored by 50 students were found to be 70. Later it was observed that a score of 45 was misread as 54. Then the correct mean is ________
Choices
Choice (4)  Response  

a.  69 

b.  69.82 

c.  79.82 

d.  59 

Question number: 18
» Statistics and Probability
Question
The average of 15 numbers is calculated as 20. It is discovered later on that while calculating the average one number, namely 41 was wrongly read as 31. The correct average is________
Choices
Choice (4)  Response  

a.  20.6 

b.  19.5 

c.  13.5 

d.  16.5 

Question number: 19
» Statistics and Probability
Question
The mean, median and mode of the following numbers 7, 4, 3, 5, 6, 3, 3, 2, 4, 3, 4, 3, 3, 4, 4, 3, 2, 2, 4, 3, 5, 4, 3, 4, 3, 4, 3, 1, 2, 3 are________
Choices
Choice (4)  Response  

a.  3, 3, 3 

b.  3.47, 3, 3 

c.  5, 4, 3 

d.  4, 3, 3 

Passage
Cards marked with the number 2 to 101 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: 20 (1 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
A number less than 14
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 21 (2 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
A number which is a perfect square
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 22 (3 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
A prime number less than 20.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 23
» Statistics and Probability
Question
The mean of ten items is x and if each item is increased by 4, then its mean will be ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

