He was very popular and a man of more than average ability.
A second position is that differences in average cognitive ability between races are caused entirely by social and/or environmental factors.
Some people have average abilities, but are so driven that they get their way.
His work required it, of course, but he'd been blessed with more than average abilities in those departments.
He seemed to be a rather mediocre man of average abilities.
As a student he displayed only average ability, but was able to develop his curiosity for things mechanical.
Most students, by definition, will be of average ability, with a smaller number below average.
He attended the local school where the teacher found him to be of average ability.
But, by virtue of the services they offer and supply, professional people hold themselves out as having more than average abilities.
But that meant 122 tomorrow, 110 the day after, putting him at about average ability.