Statistics & Probability (IMO Mathematics Olympiad Class 10): Questions 1  5 of 80
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Question number: 1
» Statistics & Probability
Question
The mean of 12 observations is . By error, one observation was noted as was misread as 21. Then the correct mean is ________
Choices
Choice (4)  Response  

a.  23.25 

b.  28.25 

c.  27.25 

d.  29.25 

Question number: 2
» Statistics & Probability
Question
A bag contains 10 balls of two different colours, out of which x are cyan. One ball is drawn at random. If 20 more cyan balls are put in the bag, the probability of drawing a cyan ball now will be double that of the previous probability of drawing a cyan ball. Then, the value of x is ________
Choices
Choice (4)  Response  

a.  4 

b.  5 

c.  8 

d.  9 

Question number: 3
» Statistics & Probability
Question
One card is drawn from a wellshuffled deck of 52 cards the probability of neither a diamond nor a red queen is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 4
» Statistics & Probability
Question
For a frequency distribution, mean, median and mode are connected by which of the following relations?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 5
» Statistics & Probability
Question
A Jar contains 20 marbles of two different colours, out of which x are Blue. One Marble is drawn at random. If 10 more blue marbles are put in the jar, the probability of drawing a blue marbles now will be double that of the previous probability of drawing a blue marbles. Then, the value of x is ________
Choices
Choice (4)  Response  

a.  5 

b.  8 

c.  2 

d.  9 
