$\mathrm{\mu }=\frac{1+3+8+\mathrm{x}+\mathrm{y}}{5}$

25 = 12 + x + y ⇒ x + y = 13 ……………….(1)

${\mathrm{\sigma }}^2=\frac{\mathrm{\Sigma }{({\mathrm{x}}_{\mathrm{i}}-\mathrm{\mu })}^2}{\mathrm{N}}$

$9.2=\frac{1+9+64+{\mathrm{x}}^2+{\mathrm{y}}^2}{5}-25$

34.2 × 5 = 74 + x² + y²

171 = 74 + x² + 2xy

97 = x² + y²                   …………….(2)

(x + y)² = x² + y² + 2xy

169 – 97 = 2xy ⇒ xy = 36

T = 4, 9

So ration is $\frac{4}{9}\mathrm{or}\frac{9}{4}$