Solution of problem N435 Laplace probability theory

Solution of problem N435 Laplace probability theory

435. It has been established that in the given technological process, on the average, 90% of the manufactured products have no defects. What is the probability that among 400 chosen at random and tested products will not have defects:
A) exactly 383 items;
B) from 354 to 372 items.

Additional information:

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