The construction time for a bridge depends on
the weather. The project is expected to take 250 days if the
weather is dry and hot. If the weather is damp and cool, the
project is expected to take 350 days. Otherwise it is expected to
take 300 days. Historical data suggest that the probability of cool
damp weather is 30% and that of hot dry weather is 20%. What is the
expected completion time for the project?