default or selected kernelversion does not have config value CONFIG_AVERAGE.
Result is shown for kernelversion 6.5.1

Averaging functions

modulename: average.ko

configname: CONFIG_AVERAGE

Linux Kernel Configuration
└─>Library routines
└─>Averaging functions
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
This option is provided for the case where no in-kernel-tree
modules require averaging functions, but a module built outside
the kernel tree does. Such modules that use library averaging
functions require Y here.

If unsure, say N.

source code:
is depended by
CONFIG_ATH5K