mediocrity:
(plural: ‘mediocrities‘; pronunciation: the letter ‘c’ has a ‘k’ sound as in “krik” — for the right pronunciation of this word, please click here)
a person with average or ordinary qualities, achievements, etc.;
a person whose abilities or qualities are not very good or not of high standards;
a person with second-rate abilities or qualities — a second-rater,

a committee of mediocrities
Among the utter uneducated people, a mediocrity seems an intellectual. (i.e. a person of average intelligence or abilities appears to be a highly qualified person when he is surrounded by people without any education or intelligence)
This school is the most suitable for Jimmy because it has already produced thousands of mediocrities like Jimmy in its two decades as the worst school in the region.
Though there are mediocrities in every field — in science there are mediocrities; in business there are mediocrities; and in fine arts there are mediocrities —, the political mediocrities enjoy the most public attention.
