Write a report to the president of the company explaining the meaning of the solutions.

Answer:

The negative part of the solution set is ignored, because you cannot produce a negative number of phones. The company has at least an 80% success rate if the next 25 or more phones that are assembled work. Because the company has already made 10 phones and 7 are not working, if the next 25 phones work, the 35th phone puts the company at its goal of 80% or more.