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Lot of airplanes

These are a lot of airplanes that are coming in at a speed of six per minute during flights.

Probability that no airplanes (x = 0) will land in the next 30 seconds?

Probability that 8 or more will land in the next 2 minutes?

Probability that 3 or fewer (less) will land in the next minute?

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## Q : Testing a claim about a population mean

When testing a claim about a population mean with ? known, either or both of these conditions is satisfied: The population is normally distributed or the sample size n is greater than 30, that is, n > 30. How do we verify that a population is n