Match List I (Question) with List II (Answer). Choose the correct answer from the options given below :

List I

i.The average of first 50 natural numbers is :

ii.The average of all odd numbers upto 100 is :

iii.The mean of 1², 2², 3², 4², 5², 6² and 7² is :

iv.The average of all prime numbers between 30 and 50 is :

List II

a.20

b.39.8

c.25.5

d.50

Ai-d, ii-c, iii-b, iv-a

Bi-b, ii-a, iii-c, iv-d

Ci-c, ii-d, iii-a, iv-b ✓ Correct

Di-a, ii-b, iii-c, iv-d

Correct answer: (C) i-c, ii-d, iii-a, iv-b

Explanation

The match is i-c, ii-d, iii-a, iv-b.

Average of first 50 natural numbers = (1 + 50)/2 = 25.5, so i - c.

Average of all odd numbers up to 100 = (1 + 99)/2 = 50, so ii - d.

Mean of 1^2 to 7^2 = 140/7 = 20, so iii - a.

Primes 31, 37, 41, 43, 47 average 199/5 = 39.8, so iv - b.

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