[" If "sum(i=1)^(18)(x(i)-8)=9" and "sum...

[" If "sum_(i=1)^(18)(x_(i)-8)=9" and "sum_(i=1)^(18)(x_(i)-8)^(2)=45],[" then the standard deviation of "x_(1),x_(2),....,x_(18)" is "3],[[" (a) "(4)/(9)," (b) "(9)/(4)," (c) "(3)/(2)," (a) "(2)/(3)]]

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