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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 : Interval for the proportion of all adults aged 18

Studies find that in a random sample of 3000 adults aged 18 and over, 1410 owned an MP3 player. The 95% large-sample confidence interval for the proportion of all adults aged 18 and over who own an MP3 player is what?