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Let x1, x2, ....., xn be n observations such that Σ x^2i = 400 and Σ xi = 80. Then a possible value of n among the following is

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Let x1, x2, ....., xn be n observations such that Σ x2i = 400 and Σ xi = 80. Then a possible value of n among the following is

(a) 12

(b) 9

(c) 18

(d) 15

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The correct option is (c) 18.

Explanation:

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