They're not necessarily.
In principle, the speedometer in the car is reading the instantaneous speed. And if you ask
"How fast were you driving at 10:31:46.0298427 AM yesterday ?", the answer would be an
instantaneous speed.
But if you ask "What's your speed for your trip to the office ?", then that's a trip that includes
turning corners, stopping for red lights, crowded streets, empty streets, fast stretches, slow
stretches, accelerating and decelerating several times, and pulling into the parking space at the
office. It comprises many different instantaneous speeds, so the answer has to be the average
for the whole trip.
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That's because averages give us some idea about general tendencies.
averages in tests, bills, income, amount of time
wasteman
The arithmetic mean, geometric mean and the harmonic mean are three example of averages.
(1,218/30) x ($3.60) = $146.16