Statistics & Probability (IMO Mathematics Olympiad Class 10): Questions 25  31 of 79
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 889 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 400.00 or
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. 


Question number: 30
» Statistics & 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: 31
» Statistics & Probability
Question
A bag contains 15 balls of two different colours, out of which x are Pink. One ball is drawn at random. If 5 more Pink balls are put in the bag, the probability of drawing a Pink ball now will be double that of the previous probability of drawing a Pink ball. Then, the value of x is ________
Choices
Choice (4)  Response  

a.  6 

b.  3 

c.  5 

d.  4 
