A research performed in hospitals analyzed the times it takes the hospital staff on average to complete non-emergency responses. The research found that the times required to work a certain task was normally distributed, with a mean of 10 minutes and a standard deviation of 3 minutes. Are you able to determine the proportion of hospital staff completing the task in less than 4 minutes, the proportion of staff completing the task in more than 5 minutes, the proportion of staff completing the task within 3 minutes? Why or why not may these requests be answered in an accurate manner?