You add all the addresses into excel and and do mail-merge with the invitation. Adding the 100 addresses is probably a lengthy process but once this is complete you can just add on addresses and once a year or whenever you have to mail something to everyone, it's a only mouse-click.
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Best practice on the users experiences can help the users to visit the website easily and get what they want as fast as possible. It is the way to improve a website understandability.
Answer
Dog breeds = observations, Average weight and energy level for each breed = variables. Each cluster is a category.
Explanation:
Using a method of clustering, she would be putting the dog breeds that are more similar together and in order to do this she has to look at various factors such as observation which are the dog breeds, and the average weight and energy level of the breeds, which represents variables. Every one of these clusters would be a category.