A construction company has to complete a project no later th…

A construction company has to complete a project no later than 3 months from now or there will be significant cost overruns.  The manager of the construction company believes that there are four possible values for the length of time the project will last in months and he has shown the probabilities below. #Months 2 2.5 3 3.5 Prob 0.1 0.2 0.5 0.2 What is the probability the project is completed on or before the deadline? (Don’t overthink)

The time it takes to grade an exam has a mean of 4.8 minutes…

The time it takes to grade an exam has a mean of 4.8 minutes and a standard deviation of 1.3 minutes.  There are 60 students in the class. What is the probability I can grade all 60 exams in under 5 hours (this is average of 5 min/test)? Report your answer as a decimal to 3 decimal places