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NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 3
12. If the mean of the observations: , , , , is 9, the mean of the last three observations is
(A)
(B)
(C)
(D)
Answer: C
13. If x represents the mean of n observations then value of is:
(A)
(B)
(C)
(D)
Answer: B
14. If each observation of the data is increased by 5, then their mean
(A) Remains the same
(B) Becomes 5 times the original mean
(C) Is decreased by 5
(D) Is increased by 5
Answer: D
15. Let x be the mean of and the mean of . If is the mean of , then is equal to
(A)
(B)
(C)
(D)
Answer: B
16. If is the mean of , then for , the mean of , is
(A)
(B)
(C) (
(D)
Answer: B
17. If are the means of n groups with number of observations respectively, then the mean x of all the groups taken together is given by:
(A)
(B)
(C)
(D)
Answer: C
18. The mean of 100 observations is 50. If one of the observations which were 50 is replaced by 150, the resulting mean will be:
(A)
(B)
(C)
(D)
Answer: B