Решение задачи N1004 теория вероятностей Лапласа

1004. The probability that the punched card is full with the operator is 0,1. Find the probability that:
a) out of 200 punched cards correctly packed will not be less than 180;
b) the same operator of ten punched cards will not be filled with more than two incorrectly filled.

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