IMO Level 1 Mathematics Olympiad (SOF) Class 10: Questions 372  378 of 968
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Question number: 372
Question
If occur with frequencies respectively, then the arithmetic mean is ________
Choices
Choice (4)  Response  

a.  120 

b.  125 

c.  115 

d.  111 

Question number: 373
Question
The mean of 11 observations is 30. If the mean of the first 6 observations is 40 and that of the last 6 observations is 44, then the Sixth observation is ________
Choices
Choice (4)  Response  

a.  174 

b.  131 

c.  137 

d.  128 

Question number: 374
Question
The coordinates of the centre of a circle passing through is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 375
Question
Find the area of triangle if the coordinates of vertices are is ________
Choices
Choice (4)  Response  

a.  2 sq. units. 

b.  5 sq. units 

c.  9 sq. units 

d.  3 sq. units 

Question number: 376
Question
Find the area of the quadrilateral, the coordinates of whose angular points taken in order are.
Choices
Choice (4)  Response  

a.  8 

b.  12 

c.  10 

d.  6 

Question number: 377
Question
Find the area of triangle if the coordinates of vertices are is ________
Choices
Choice (4)  Response  

a.  45.2 sq. units 

b.  20.5 sq. units. 

c.  19.3 sq. units 

d.  33.5 sq. units 

Question number: 378
Question
The mean weight of a class of 24 students is kg. if the weight of the teacher is included, the mean rises by 400 g. Then the weight of the teacher is ________
Choices
Choice (4)  Response  

a.  65 kg 

b.  50 kg 

c.  55 kg 

d.  45 kg 
