Решение задачи N19 теория вероятностей

19. Shooting is conducted from the point X along the straight line OX. The average flight range is "a". It is assumed that the flight range is distributed according to the normal law with an average quadratic deviation of 80 m. Find what percentage of the projectiles produced allows a flight from 120 m to 160 m.

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