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The number of people entering a gambling casino average at a rate of 3 people every...

The number of people entering a gambling casino average at a rate of 3 people every 60 minutes.

Q: Given 4 people entered the casino between 12 pm and 1 pm, what is the probability that at least one person entered the casino between 12pm and 12:20pm?

Math   Statistics-And-Probability   
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