The phrase 'reached the average' is correct and can be used in written English.
It is typically used to describe reaching a mathematical or statistical average, such as in the following example: The students in Mrs. Smith's class sat the math exam, and their results overall reached the average.
Has the Federal Reserve monetary policy reached the average American?
Incomes, once just above half the state average, reached the average by 1980.
"We didn't receive notification from the New York Stock Exchange, but we were aware yesterday that we had reached the average closing price trigger, and so the board took this action," Mr. Price said.
Because of these risks and a lowered chance of success, Australian facilities do not usually perform IVF on a woman once she has reached the average age of natural menopause, which is 51.
Each of the succeeding nymphal stages (there are usually six in this species) shows an increase in the number of segments until, by the time the adult stage is reached, the average number is 94.
On the other hand, when the respective thresholds are reached, the average queuing delay increases whenever the load increases.
One of the most effective means of reaching the average person in Afghanistan is through radio broadcasts.
So automakers would no longer have to build small cars to help reach the average required of all cars.
International financial support for refugees — and for the Jordanian government — does not necessarily reach the average Jordanian family.
At that rate, it would take the UK 70 years to reach the average rate of low pay in the 34 nations in the Organisation for Economic Co-operation and Development.
Moreover, the use of the metaphor of fire has helped the candidate overcome a potentially worrisome personality drawback: that he is too cool and cerebral to reach the average voter.
