Statistics & Probability (IMO Mathematics Olympiad Class 10): Questions 25  31 of 79
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Question number: 25
» Statistics & Probability
Question
The mean of ten numbers is 60. If one number is excluded, then their mean is 50, the excluded number is ________
Choices
Choice (4)  Response  

a.  130  
b.  160  
c.  140  
d.  150 
Question number: 26
» Statistics & Probability
Question
The mean of 7 observations is 20. If the mean of the first 4 observations is 20 and that of the last 4 observations is 16, then the Fourth observation is ________
Choices
Choice (4)  Response  

a.  3  
b.  7  
c.  8  
d.  4 
Question number: 27
» Statistics & Probability
Question
The mean of is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 28
» Statistics & Probability
Question
If occur with frequencies respectively, then the arithmetic mean is ________
Choices
Choice (4)  Response  

a.  4.4  
b.  5.5  
c.  3.5  
d.  6.5 
Question number: 29
» Statistics & Probability
Question
A bag contains 6 Red, 9 Blue and 5 Black marbles. If a marble is drawn at random from the bag, the probability that the marble drawn is red or Blue, is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 30
» Statistics & Probability
Question
One card is drawn from a wellshuffled deck of 52 cards the probability of drawing an ace is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 31
» Statistics & Probability
Question
A bag contains 15 balls of two different colours, out of which x are Pink. One ball is drawn at random. If 5 more Pink balls are put in the bag, the probability of drawing a Pink ball now will be double that of the previous probability of drawing a Pink ball. Then, the value of x is ________
Choices
Choice (4)  Response  

a.  6  
b.  3  
c.  5  
d.  4 