Since the temperature is 71 degree, the scale of measurement is Fahrenheit scale.
For converting Fahrenheit scale to Kelvin scale we have the formula.
[tex]T_K = \frac{5}{9} (T_F+459.67)[/tex]
Here [tex]T_K = 71^0F[/tex]
So, [tex]T_K = \frac{5}{9} (71+459.67)[/tex]
[tex]T_K = 294.82 ^0K[/tex]
Outside temperature in kelvin scale [tex]= 294.82 ^0K[/tex]