A cylindrical core $($R$=6\mathrm{.}3$ m$,$ H$=7\mathrm{.}9$ m$)$ of a graphite$-$moderated gas$-$cooled reactor has the total

thermal power equal to $700$ MW$,$ from $2940$ fuel assemblies. Assuming the extrapolation length d $=0\mathrm{.}52$

m$,$ calculate:

$($a$)$ the mean, the highest and the lowest power in fuel assemblies,

$($b$)$ the power of the fuel assembly located at r$=$R$/2$ distance from the core centerline.