Question
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
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.
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