The standard deviations of two sets of observations X= \{ x_1\} and Y=\{y_i\} (i=1,2,..........100) are respectively 5 and 6. If x^{-},y^{-} are their means and \\sum^{100}_{i=1}(x_i-x^{-})(y_i-y^{-})=600, then the standard deviation of Z=\{z_i\/z_i=x_i-y_i\} is

TS EAMCET 11-Sep-2020 Shift 2 Solved Paper

Section: Mathematics

Question : 36 of 160

Marks: +1, -0

The standard deviations of two sets of observations X={x1} and Y={yi} (i=1,2,..........100) are respectively 5 and 6. If

−

are their means and

100

i=1

(xi−

−

)(yi−

−

)=600, then the standard deviation of Z={zi∕zi=xi−yi} is

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