Statistics & Probability (IMO Mathematics Olympiad Class 10): Questions 24  29 of 80
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Question number: 24
» Statistics & Probability
Question
The average temperatures of Monday, Tuesday, Wednesday and Thursday was . The average temperature of Tuesday, Wednesday, Thursday and Friday was . If the temperature on Monday was , then the temperature on Friday was ________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 25
» Statistics & Probability
Question
The mean of ten numbers is 60. If one number is excluded, then their mean is 50, the excluded number is ________
Choices
Choice (4)  Response  

a.  130 

b.  160 

c.  140 

d.  150 

Question number: 26
» Statistics & Probability
Question
The mean of 7 observations is 20. If the mean of the first 4 observations is 20 and that of the last 4 observations is 16, then the Fourth observation is ________
Choices
Choice (4)  Response  

a.  3 

b.  7 

c.  8 

d.  4 

Question number: 27
» Statistics & Probability
Question
The mean of is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 28
» Statistics & Probability
Question
If occur with frequencies respectively, then the arithmetic mean is ________
Choices
Choice (4)  Response  

a.  4.4 

b.  5.5 

c.  3.5 

d.  6.5 

Question number: 29
» Statistics & Probability
Question
A bag contains 6 Red, 9 Blue and 5 Black marbles. If a marble is drawn at random from the bag, the probability that the marble drawn is red or Blue, is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

