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That's an exaggeration but I assume 70-80% in upper middle class would be realistic? At least in Norway and Denmark, maybe a bit less so in Sweden.

The numbers differ a bit in different sources, but seems to be around 60% for Sweden. https://gs.statcounter.com/os-market-share/mobile/sweden Based on that upper middle class being a bit more common seems likely.

Regardless, the original point stands regardless of it being 50% or 80%.