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$Let x_{1}, x_{2}, \dots, x_{n} be n observations such that Σ x_{i}^{2} = 400 and Σ x_{i} = 80 . Then a possible value of n among the following is$

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Correct option is D

Since root mean square ≥ arithmetic mean ∑i=1n xi2n≥∑i=1n xin=400n≥80n⇒n≥16Hence, the possible value of n is 18.

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Variate x	1	2	3	4	5
Frequency f of x	4	5	y	1	2

Let x1,x2,…,xn be n observations such that Σxi2=400 and Σxi=80. Then a possible value of n among the following is

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Ready to Test Your Skills?

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$Let x_{1}, x_{2}, \dots, x_{n} be n observations such that Σ x_{i}^{2} = 400 and Σ x_{i} = 80 . Then a possible value of n among the following is$