Let \[{{x}_{1}},{{x}_{2}},...{{x}_{n}}\] be n observations such that \[\sum{x_{i}^{2}=400}\] and \[\sum{{{x}_{i}}=80.}\] Then the possible value of n among the following is

Let \[{{x}_{1}},{{x}_{2}},...{{x}_{n}}\] be n observations such that \

1.	Let \[{{x}_{1}},{{x}_{2}},...{{x}_{n}}\] be n observations such that \[\sum{x_{i}^{2}=400}\] and \[\sum{{{x}_{i}}=80.}\] Then the possible value of n among the following is
A.	15
B.	18
C.	9
D.	12
Answer» C. 9

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Let \[{{x}_{1}},{{x}_{2}},...{{x}_{n}}\] be n observations such that \[\sum{x_{i}^{2}=400}\] and \[\sum{{{x}_{i}}=80.}\] Then the possible value of n among the following is

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