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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 : 11C) 11 : 10 D) 11 : 9 |
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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 Correct option is A) 9: 11 |
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