It’s what the news story said
“It’s what the news story said”
Then whoever wrote your “news story” is an idiot who cannot read. Iceland has not conducted RANDOM tests. They have, however, freely tested people without screening them first. Not quite the same thing.
They found, at least 3 weeks ago, that half of the people who tested positive were asymptomatic. NOT that half of the people tested have had the virus.
Iceland publishes their results. They are here:
35253 tested. Of those, 1701 have tested positive. That means about 850 people out of 1700 have been positive but without symptoms. Of those with the virus - 1701, 8 have died.