1.

Thestandard deviations of x_(i) (i=1,2,. . . ,10) and y_(i) (i=1, . . . , 10)are respectively 'a' and 'b' .bar(x), bar(y)are the means of these two sets of observation respectively . If z_(i) = (x_(i) - bar(x))(y_(i) - bar(y)) and underset(i = 1)overset(10)sum z_(i) =cthen the standard deviations of the observation= (x_(i) - y_(i)) ,(i = 1, 2, . . . , 10)is

Answer»

`sqrt(a^(2) +B^(2)+(c)/(5))`
`sqrt(a^(2) +b^(2) -(c)/(5))`
`sqrt(a^(2) +b^(2) -(c^(2))/(5))`
`sqrt(a^(2) +b^(2) +(c^(2))/(5))`

ANSWER :B


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