Ex $1\mathrm{.}25$: Heat transfer from the walls of a tube to a flowing fluid is related by the formula $=0\mathrm{.}023R{e}^{0\mathrm{.}8}{P}^{0\mathrm{.}3},$ where $$ is the Nusselt number based on diameter, $Re$ is the Reynolds number based on diameter and $Pr$ is the fluid Prandtl number. We are given the parameter values of $Re=50000+-500,Pr=4\mathrm{.}71+-0\mathrm{.}25.$ Find the nominal value of Nusselt number and specify a suitable uncertainty for the same. Express the uncertainty also as a percentage.