Solution of problem N1438 Bernoulli probability theory

Solution of problem N1438 Bernoulli probability theory

1438. There are 6 light bulbs in the room. The probability that each bulb will remain intact for a year is 0.7. Find: a) the likelihood that during the year will have to replace 2 light bulbs; b) the most probable number of light bulbs that will work during the year.

Additional information:

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