Solution of problem N3990 probability theory total prob

Solution of problem N3990 probability theory total prob

3990. The store has televisions with imported and domestic CRT in the ratio of 8: 2. The probability of failure during the warranty period of the TV with an imported kinescope is 0.01, with domestic - 0.015. Randomly selected TV. Find the probability that it will withstand the warranty period.

Additional information:

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