Statistics & Probability (IMO Mathematics Olympiad Class 10): Questions 18  23 of 80
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Question number: 18
» Statistics & Probability
Question
A Bus maintains an average speed of 50 km/hr while going from A to B and maintains an average speed of 80 km/hr while coming back from B to A. the average speed of the bus is ________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 19
» Statistics & Probability
Question
A bag contains 5 Green, 4 Aqua, 9 Blue and 6 purple marbles. If a marble is drawn at random from the bag, the probability that the marble drawn is Aqua or Purple, is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 20
» Statistics & Probability
Question
In a single throws of a die, the probability of getting a multiple of 3 is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 21
» Statistics & Probability
Question
If occur with frequencies respectively, then the arithmetic mean is ________
Choices
Choice (4)  Response  

a.  125 

b.  111 

c.  120 

d.  115 

Question number: 22
» Statistics & Probability
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.  128 

c.  137 

d.  131 

Question number: 23
» Statistics & Probability
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.  55 kg 

b.  45 kg 

c.  65 kg 

d.  50 kg 
