Solution of problem N1348 Laplace probability theory

Solution of problem N1348 Laplace probability theory

1348. A construction company engaged in the installation of summer cottages, spreads out leaflets on mailboxes. The previous experience of the company shows that in about one case of two thousand there is an order. Find the likelihood that when placing 100 thousand sheets of the number of orders will be:
a) is 48;
b) be in the range from 45 to 55.

Additional information:

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