Match the following column.


Column I



Column II



A. The mean of first 10 odd numbers =



(p) 11.2



B. The mean of first 10 even numbers =



(q) 10



C. The mean of first 10 prime numbers =



(r) 11



D. The mean of first 10 composite numbers =



(s) 12.9



The correct answer is:


(a)-……., (b)-……., (c)-……., (d)-…….,

(A) → (q),


(B) → (r),


(C) → (s),


(D) → (p)


Explanation:


(A) First 10 odd numbers are = 1, 3, 5, 7, 9, 11, 13, 15, 17, 19


Sum of these numbers = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100


n = 10


Mean = 100/10 = 10


(B) First 10 even numbers are = 2, 4, 6, 8, 10, 12, 14, 16, 18, 20


Sum of these numbers = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 = 110


n = 10


Mean = 110/10 = 11.0


(C) First 10 prime numbers are = 2, 3, 5, 7, 11, 13, 17, 19, 23, 29


Sum of these numbers = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 = 129


n = 10


Mean = 129/10 = 12.9


(D) First 10 composite numbers are = 4, 6, 8, 9, 10, 12, 14, 15, 16, 18


Sum of these numbers = 4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 112


n = 10


Mean = 112/10 = 11.2


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