Question: The mayor said that local fire stations are so well equipped and staffed that they are able to get to a fire in five minutes or less about 80% of the time. If this is so, find the probability that out of the next ten fire calls:

1. The fire department arrives in five minutes or less for every call.
2. It takes five minutes or less for five or more of the calls.
3. It takes the fire department more than five minutes to arrive for all ten calls.
4. For at least three calls it takes more than five minutes for the fire department to arrive.

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