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Unformatted text preview: But it is crucial to remember that the mu must be stated in the same interval as the X being used in the formula. For example, let us say: mu=5 customers arriving at a McDonald's in 10 minutes, But you want to calculate probability that no one arrives in a 15 minute interval. Since mu is in terms of 10 minutes, you must first convert it to 15 minute intervals before computing probability of X=0 in 15 minutes! So: if mu=5 per 10 minutes, then we can compute: mu=7.5 per 15 minutes. Now that we have mu expressed per 15 minutes, we can solve probability of X=0 in 15 minutes: P(0)=[(7.5^0)(e^7.5)]/0!...
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 Spring '08
 Nabavi

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