You have asked your programmer to give you an estimate of how long she will take to complete a software program. She mentions that she would most probably get the job finished in 2 hours. But if she runs into some issues with doing unit-testing for the program, it could take her as long as 7 hours. On the other hand, she may be able to pick up a similar program from the organization process assets, in which case it will take her only 1 hour. What is the standard deviation