Michael Is Line Manager at a Production Facility

Michael is line manager at a production facility. He runs daily checks to ensure that his team of workers is performing well. Today he discovers that his team has produced only 110 units, while they are expected to have a daily output of at least 150 units. This shortfall is particularly puzzling because his team had consistently been producing an average of 155 units everyday over the last month. Which of the following figures represents the standard for performance for this team?

A) 155 units
B) 150 units
C) 110 units
D) 40 units
E) 5 units