When circuit boards used in the manufacture of computers are tested, the long-run percentage of defectives is 0.1%. There are 400 computers are produced. The customer bought the 5 computers. Let X be...

When circuit boards used in the manufacture of computers are tested, the
long-run percentage of defectives is 0.1%. There are 400 computers are
produced. The customer bought the 5 computers. Let X be number of computers
with defective boards among purchased. Find the mass function, the cumulative
distribution function, the expected values, the variance and the standard
deviation