IMO Mathematics Olympiad (SOF) Class 10: Questions 484  489 of 958
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Question number: 484
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: 485
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: 486
Question
Find the area of the quadrilateral, the coordinates of whose angular points taken in order are.
Choices
Choice (4)  Response  

a.  712 

b.  146 

c.  115 

d.  184 

Question number: 487
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: 488
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: 489
Question
is three vertices of the parallelogram WXYZ. The coordinates of fourth vertex is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

