The number of deliveries per week varies among the posts in the sample (Canada, Finland, and Portugal deliver five times per week, Great Britain delivers 12 times weekly in urban areas and six in rural areas).
Britain delivers 12 times a week in urban areas because there are more people ordering packages.
mnli hypothesis: Britain delivers 12 times a week in urban areas because there are more people ordering packages. premise: The number of deliveries per week varies among the posts in the sample (Canada, Finland, and Portugal deliver five times per week, Great Britain delivers 12 times weekly in urban areas and six in rural areas).