Solution of problem N3607 probability theory

Solution of problem N3607 probability theory

3607. Among the parts arriving at the assembly from the first machine, 0.1% is defective, from the second - 0.2%, from the third - 0.25%, from the fourth - 0.5%. Their performance is 4: 3: 2: 1 respectively. Taken at random item was standard. Find the probability that it is made on the second machine.

Additional information:

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