as it should if Px is a probability. The sum (2) indicates that the sum of all probabilities for finding different values of x must equal unity. You can check that the summation yields unity, approximately, by adding the probabilities in a given row of the table. Finally, note that the probability of obtaining zero events is significant even if the mean m is as high as 3 or 4. You might expect two cars a minute to pass your house, on average, but in 13.5% of the 1-minute intervals, no cars will pass.

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Telescopes Mastery

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