Solution of problem N4207 Laplace probability theory

Solution of problem N4207 Laplace probability theory

4207. On average, 75% of examinations are completed by students on time. It is necessary: a) to find the likelihood that out of 900 tests, from 200 to 250 (inclusive) were completed on time, b) to find the most probable number of tests completed on time, and the probability of this event.

Additional information:

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