The mean and variance of n observations x_{1}, x_{2}, x_{3}, . . ., x_{n} are 5 and 0 respectively. If \sum_{i=1}^{n} x_{i}^{2}=400, then the value of n is equal to

KEAM 2010 Math Paper

Question : 22 of 120

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The mean and variance of n observations x1,x2,x3,...,xn are 5 and 0 respectively. If

∑

i=1

xi2=400, then the value of n is equal to

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