1. Suppose a home has a cable modem with 75 Mbps downstream. There are 5 users in the house, each with a computer, tablet, and phone. The phones maintain 100 kbps traffic constantly to keep Facebook updated. Watching a 4k video on a computer takes 15 Mbps. Browsing the news on a tablet takes 10 Mbps, but only downloads 10% of the time. Assume it is a packet-switched network.

   1. Can each member of the house watch a video, keep Facebook updated, and browse the news all at the same time? How much (percentage) of their downstream bandwidth is used?

   2. How many 4k videos can they watch simultaneously if all other devices are off?

   3. What is the probability all 5 users are downloading news at the same time?

   4. How long will it take to download 1TB file if everyone else has Facebook updating and nothing else is on?

5. If everyone is only browsing news on a tablet given the above bandwidth and usage, what is the maximum number of people who could be doing the same thing before there is bandwidth contention?