Statistics & Probability (IMO Mathematics Olympiad Class 10): Questions 71  76 of 80
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Question number: 71
» Statistics & Probability
Question
The average of 15 results is 50. If the average of the first six results is 82 and that of the last six is 62, then the sixth result is ________
Choices
Choice (4)  Response  

a.  57 

b.  58 

c.  59 

d.  60 

Question number: 72
» Statistics & Probability
Question
The king, queen and jack of clubs are removed from a deck of 52 playing cards and then wellshuffled. One card is selected from the remaining cards. The probability of getting a ‘8’ of black color is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 73
» Statistics & Probability
Question
The mean of 10 observations is. if each observation is multiplied by 4, then what is the new mean?
Choices
Choice (4)  Response  

a.  50 

b.  70 

c.  30 

d.  60 

Question number: 74
» Statistics & Probability
Question
The mean of 9 observations is 36. If the mean of the first 5 observations is 32 and that of the last 5 observations is 39, then the fifth observation is ________
Choices
Choice (4)  Response  

a.  37 

b.  28 

c.  31 

d.  43 

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 
