The phrase "arrive on average" is correct and usable in written English.
It can be used when discussing statistical data or general trends regarding the time or conditions under which something typically occurs.
Example: "Participants in the study arrive on average 15 minutes late to the meetings."
Alternatives: "typically arrive" or "generally arrive".
Within a day later this had risen to 5,500, with calls at one point arriving, on average, every 10 seconds.
Because of climate change, spring, summer, fall and winter in the temperate zones are all arriving on average 1.7 days earlier than they ever have before.
Over those same 30 years, despite natural year-to-year variability, the birds have arrived, on average, five days earlier each decade.
It's not that they have just arrived, on average the people we see will have been here for six years.
In the case of the cuckoos, for instance, spring greenery started growing 1.2 days earlier per year, although the birds arrived on average 0.2 days early.
Pediatrician consultants arrived, on average, in 0 29 min in 68% of EDs, in 30 59 min in 30% of EDs, and in 60 min or more in 2% of EDs.
In hospitals without a pediatric inpatient department or a dedicated pediatric intensive care unit, pediatrician consultants arrived, on average, in 0 29 min in 59% of EDs, in 30 59 min in 39% of EDs, and in 60 min or more in 2% of EDs.
In hospitals with a pediatric inpatient department or a dedicated pediatric intensive care unit, pediatrician consultants arrived, on average, in 0 29 min in 73% of EDs, in 30 59 min in 23% of EDs, and in 60 min or more in 4% of EDs.
Full menopause arrives on average somewhere between the ages of 45 and 55, with 80% of women ceasing to menstruate by age 54.
All sample tubes, plastic containers, and sealed plastic bags used for transport were surface disinfected with a 0.5% hypochlorite solution, and transported to the European Mobile Laboratory in Guéckédou, where they arrived on average within 1 hour after collection.
