The phrase "average difficulty" is correct and can be used in written English.
It typically refers to the level of difficulty that is considered to be typical or average for a particular task or situation. It can be used in various contexts, such as describing a test, a job interview, or a physical activity. Example: The math exam had an average difficulty level, with a good balance of easy and challenging questions.
In general you seem to have found the puzzle of average difficulty.
The Bad partition contains pairs of images of average difficulty to recognize.
The report found that while the average difficulty of books rose as pupils got older, it did not match the rate at which reading skills should be improving.
Most who commented said they found BEWITCH a reasonably friendly clue word in a plain puzzle of average difficulty, presenting few real problems, i.e. the kind I ideally aim for.
To examine the time-course of cognitive training, we calculated standardized improvement scores at each of the 20 training sessions by converting the average difficulty for each task to a standardized score for each of the four active training groups (three experimental groups and an active control group).
GR7 = (Grade x Modal Shift) / Average Difficulty.
According to all those who commented, this was a plain of more-than-average difficulty, perhaps because it contained a high percentage of unfamiliar words.
In addition, both averaged difficulty indices indicate moderate values, which is an encouraging result since a moderate value of difficulty index means that the questions are not too easy nor too difficult.
However, temporal averaging difficulties in interpreting tracks, particularly in marginal environments where water levels can vary repeatedly over hours or minutes, makes it difficult to know the water depth at the time of track formation.
Nevertheless, there is evidence that people who receive exemptions from OOP payments have above-average difficulties in making ends meet before reaching that ceiling [19].
This study reported limitations: a lack of follow-up, the use of moderate physical activity end point averages, difficulties in collecting data at a local level and low numbers of completers (n=1022) compared with those engaged (n=10 433).
