A Sample of Size 400 Is Drawn from a Population $P ( \bar { x } < 4,990 )$

Short Answer

A sample of size 400 is drawn from a population whose mean and variance are 5,000 and 10,000,respectively.Find the following probabilities:
A) $P ( \bar { x } < 4,990 )$ ____________________
B) $P ( 4,995 < \bar { x } < 5,010 )$ ____________________
C) $P ( \bar { x } = 5,000 )$ ____________________