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Means of first 10 whole numbers and first 10 natural numbers is in the ratio of

 A) 9: 11 

B) 10 : 11

C) 11 : 10 

D) 11 : 9

2 Answers

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Best answer

Correct option is (A) 9: 11

Mean of first 10 whole numbers \(=\frac{0+1+2+....+9}{10}\)

\(=\frac{9\times10}{20}=\frac92\)

Mean of first 10 natural numbers \(=\frac{1+2+3+....+10}{10}\)

\(=\frac{10\times11}{20}=\frac{11}2\)

\(\therefore\) Their ratio \(=\cfrac{\frac92}{\frac{11}2}\)

\(=\frac9{11}\) = 9 : 11

+1 vote
by (42.4k points)

Correct option is   A) 9: 11

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