If mean and standard deviation of 5 observations \( x_{1} \),
\( \m...
If mean and standard deviation of 5 observations \( x_{1} \),
\( \mathrm{P} \) \( x_{2}, x_{3}, x_{4}, x_{5} \), are 10 and 3 , respectively, then the
W variance of 6 observations \( x_{1}, x_{2}, \ldots ., x_{3} \) and -50 is equal to
(1) 509.5
(2) 586.5
(3) 582.5
(4) 507.5
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