The fuck does that even mean?? Assuming you're just too embarrassed to ask, I'll lay it out for you:

Those Scandinavian countries have mixed economies. The "mixed" in there is referring to a combination of market capitalism and socialism.

Common to all mixed economies is a combination of free-market principles and principles of socialism.

https://en.wikipedia.org/wiki/Mixed_economy

The markets are highly regulated. Many services that are run by private enterprises in the "free market capitalism" that you're referring to (i.e. Laissez-faire) are instead nationalized, removing the profit motive from services that improve the lives of every citizen. They have very strong social safety nets and universal health care.

It's no coincidence that those nations consistently top those lists.