In a K-s(o)-high-statistics sample, created in pp reactions at 27.5 GeV, we
determined K-s(o) mean life to be (0.893 +/- 0.006) x 10(-10) s. This resu
lt agrees, inside experimental errors, with the world wide accepted value.
In this paper we describe the experimental details and the used technique t
o measure K-s(o) mean life.