The phrase "an average drop of" is correct and usable in written English.
It can be used when discussing a decrease in a quantity or measurement, typically in statistical or analytical contexts.
Example: "The report indicated an average drop of 15% in sales over the last quarter."
Alternatives: "a typical decrease of" or "an average decline of".
The 397 firearm incidents recorded last year equate to an average drop of almost two thirds.
Those six low-turnover teams combined to lose 47 more games the next season, an average drop of nearly eight games from one year to the next.
There's an average drop of 5.2% year on year to be sure – more grist for the gloom-mongers' mill – yet look a little deeper.
Yet Latin American stockmarkets have actually fallen more sharply, by around 40% over the past year, compared with an average drop of only 10% in Eastern Europe.
And the decline of 19,000 jobs, compared with an average drop of 60,000 jobs in March and April, did indicate that corporate cost-cutting was not accelerating.
City Hall experts say the plan to reclaim the riverbanks from traffic would lead to an average drop of 15% in nitrogen dioxide levels as well as a reduction in noise pollution.
The study estimated an average drop out rate of 10% (3 per center) that varied, with minimum in Khulna and maximum in Dhaka.
The inclusion of water channels led to an average drop in production of 73% while water zones in the form of interconnected nodes led to a 12%reductionn.
He added that after the cameras were installed, each housing project experienced an average drop in crime of about 35percentt.
They show an average drop in full membership of about 10% across constituencies that have published their figures over the last two years.
The drop hammer had a weight of 88 lb (40 kg) at an average dropping height of 400 mm which was kept constant during the pile load test.
