4 Two random variables \(X\) and \(Y\) have the distributions \(\mathrm { B } ( m , p )\) and \(\mathrm { B } ( n , p )\) respectively, where \(p > 0\). It is known that
\(\mathrm { E } ( Y ) = 2 \mathrm { E } ( X )\)
\(\operatorname { Var } ( Y ) = 1.2 \mathrm { E } ( X )\).