A new requirement from the BlueCity Department of Health is that hair-

cut appointments must be limited to one masked customer and one masked

hair-stylist at a time. Mask wearing is most effective when both parties

are wearing them. After some research, the BlueCity DoH has concluded

that residents wear face masks 80% of the time. On average, BlueCity

has 10 haircut appointments a day throughout the town. What is the ex-

pected number of haircut appointments per day that have both parties fully

masked?

You may assume that customers and hair-stylists choose independently and

at random (80%) to wear masks for every appointment.