19.X.7. Summary

Try these first

1. 1.

   What is the mean and variance of a Poisson distribution?

   Hint

   Think about the parameters that define this distribution.

2. 2.

   Name one application of the Poisson distribution.

   Hint

   Consider where you see random occurrences.

3. 3.

   What is the mean of a Poisson distribution?

   • BB
   • 2BB
   • 0

   Hint

   Remember what represents the rate of events.

4. 4.

   The Poisson distribution is appropriate when events occur how?

   • True
   • False

   Hint

   Consider the conditions defining the distribution.

5. 5.

   A bookstore sells an average of 20 books a day. What is the probability that they will sell exactly 18 books tomorrow?

   Hint

   Calculate using the PMF formula and remember to use BB = 20.

6. 6.

   In a certain region, the average number of earthquakes per month is 3. What is the probability of experiencing more than 4 earthquakes in the next month?

   Hint

   Calculate the probabilities for 0 to 4 first, then subtract from 1.