Solution of problem N345 Laplace probability theory

Solution of problem N345 Laplace probability theory

345. Verification work on the theory of probability from the first time to a positive evaluation, on average, is written by 80% of students. Find the probability that out of 100 students from the first time the control to a positive rating will be written from 75 to 90 students.

Additional information:

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