1. Polychlorinated biphenyl (PCB) is among a group of organic pollutants found in a variety of products, such as coolants, insulating materials, and lubricants in electrical equipment. Disposal of items containing less than 50parts per million (ppm) PCB is generally not regulated. A certain kind of small capacitor contains PCB with a mean of 48'2ppm and a standard deviation of 8ppm. The Environmental Protection Agency takes a random sample of 39 of these small capacitors, planning to regulate the disposal of such capacitors if the sample mean amount of PCB is 49-5 ppm or more. Find the probability that the disposal of such capacitors will be regulated