Solution of problem N1419 Poisson probability theory

Solution of problem N1419 Poisson probability theory

1419. The plant produces devices, among which an average of 98% without defects. Find the probability that in a batch of 200 appliances:
a) two with a defect;
b) not more than one with a defect;
c) at least one with a defect.
Find the most probable number of parts with a defect.

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)