Statistics & Probability (IMO Mathematics Olympiad Class 10): Questions 75  79 of 79
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Question number: 75
» Statistics & Probability
Question
A card is drawn from a packet of 200 cards numbered 1 to 200. The probability of drawing a number which is a thrice is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 76
» Statistics & Probability
Question
The average of 11 results is 60. If the average of the first six results is 72 and that of the last six is 52, then the sixth result is ________
Choices
Choice (4)  Response  

a.  87 

b.  88 

c.  84 

d.  86 

Question number: 77
» Statistics & Probability
Question
The mean of eight numbers is 30. If one number is excluded, then their mean is 34, the excluded number is ________
Choices
Choice (4)  Response  

a.  5 

b.  2 

c.  8 

d.  6 

Question number: 78
» Statistics & Probability
Question
The mean of 10 observations is . By error, one observation was noted as was misread as 24. Then the correct mean is ________
Choices
Choice (4)  Response  

a.  21 

b.  27 

c.  25 

d.  23 

Question number: 79
» Statistics & Probability
Question
A drawer contains 8 red socks, 12 white socks and 10 blue socks. Without looking you draw out a sock and then draw out a second sock without returning the first sock. What is the probability that the first sock and second sock are both white?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

