Statistics & Probability (IMO Mathematics Olympiad (SOF) Class 10): Questions 77  80 of 80
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Question number: 77
» Statistics & Probability
Question
The mean of eight numbers is 30. If one number is excluded, then their mean is 34, the excluded number is ________
Choices
Choice (4)  Response  

a.  5 

b.  2 

c.  8 

d.  6 

Question number: 78
» Statistics & Probability
Question
The mean of 10 observations is. By error, one observation was noted as was misread as 24. Then the correct mean is ________
Choices
Choice (4)  Response  

a.  21 

b.  27 

c.  25 

d.  23 

Question number: 79
» Statistics & Probability
Question
A drawer contains 8 red socks, 12 white socks and 10 blue socks. Without looking you draw out a sock and then draw out a second sock without returning the first sock. What is the probability that the first sock and second sock are both white?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 80
» Statistics & Probability
Question
Kruti took a loan at simple interest at in the first year with increases of in each subsequent year. She paid as interest after 4 years. How much loan did she take?
Choices
Choice (4)  Response  

a.  Rs. 15800 

b.  Rs. 30000 

c.  Rs. 12500 

d.  Rs. 33250 
