Determine the constant pressure specific heat $(k\frac{J}{k}g)$ for an ideal gas given the data and relationship for specific heat shown below.

$T=302K$

$Cp(k\frac{J}{k}g-K)=2\mathrm{.}56-7\mathrm{.}58E-3*T+8\mathrm{.}20E-6*T^2$; where T is in Kelvin

Gas constant $(R)=0\mathrm{.}276$ kJ$/$kg$-$K

Note: Give your answer to three decimal places.