Question

if x and y are related by 2x+3y+4=0 and standard deviation of x is 9 then standard deviation of y is

Answer 1

Answer:

If  , ,

a b c  are three distinct real numbers then the equation

()()()()()()

xbxcxcxaxaxb

     

2222

abcx

    0  has

()()()()()()

abacbcbacacb

     

(A) exactly one root(B) exactly two roots(C) no root(D) None of these