This is the 673rd most frequent Russian word.
среднем
"Average" or "in the middle."
The phrase 'В среднем' translates to 'On average,' and it is used as an adverbial phrase to describe an average statistical value.
В среднем семья тратит на продукты около 30% дохода.
On average, a family spends about 30% of their income on groceries.
The phrase 'на среднем уровне' means 'at an intermediate level,' where 'среднем' describes a moderate or median category.
Человек на среднем уровне познания может понять эту концепцию.
A person at an intermediate level of knowledge can understand this concept.
The word 'среднем' indicates moderation or simplicity, used here as an adjective in instrumental case.