Susan Williams has been the production manager of Medical Suppliers, Inc., for the past 17 years. Medi-cal Suppliers, Inc., is a producer of bandages and arm slings. During the past 5 years, the demand for No-Stick bandages has been fairly constant. On aver-age, sales have been about 87,000 packages of No-Stick. Susan has reason to believe that the distribution of No-Stick follows a normal curve, with a standard de-viation of 4,000 packages. What is the probability that sales will be less than 81,000 packages?