Statistics and Probability (IMO Mathematics Olympiad Class 9): Questions 96  101 of 101
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Question number: 96
» Statistics and Probability
Question
In a class test, in Science, 45 students scored 88 marks, 15 students scored 75 marks and 5 scored 60 marks. The mean of their score is (approximately) ________
Choices
Choice (4)  Response  

a.  75 marks 

b.  83 marks 

c.  80 marks 

d.  90 marks 

Question number: 97
» Statistics and Probability
Question
The mean, median and mode of the following numbers 2, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 1, 1, 6, 8, 8, 4, 3, 2, 2 are________
Choices
Choice (4)  Response  

a.  3, 4, 3 

b.  4, 4, 2 

c.  3, 3, 5 

d.  3, 4, 5 

Question number: 98
» Statistics and Probability
Question
Mean marks scored by 100 students were found to be 120. Later it was observed that a score of 59 was misread as 95. Then the correct mean is ________
Choices
Choice (4)  Response  

a.  179.82 

b.  169 

c.  169.82 

d.  119.64 

Question number: 99
» Statistics and Probability
Question
A contractor employed 14 labourers at Rs. 18 each per day, 12 labourers at Rs. 22 each per day, 9 labourers at Rs. 32 each per day and 5 labourers at Rs. 62 each per day. The average wages paid is ________
Choices
Choice (4)  Response  

a.  Rs. 28 

b.  Rs. 14 

c.  Rs. 30 

d.  Rs. 26 

Question number: 100
» Statistics and Probability
Question
One card is drawn from a wellshuffled deck of 52 cards. The probability of drawing an ace is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 101
» Statistics and Probability
Question
The mean of 18 observations is 30. If the mean of the first 8 observations is 25 and that of the last 10 observations is 34, then the 8^{th} observation is ________
Choices
Choice (4)  Response  

a.  68 

b.  70 

c.  66 

d.  58 
