Conclusion
Put it Together
At the beginning of the module, we left Joan pondering the idea that even though her birthday is unique to her - we all have only one birthday - each possible birth date is not unique with respect to how many people have it. In other words, Joan has one birthday, but many people were also born on that day.
We proposed the following idea:
Think of each individual person on the earth as a variable, p. Now imagine that all the birthdays are a function, B. For each individual person you place in the Birthday function, you will get out one unique birthday for that person.
As we have shown in this module, we can write this relationship as a function in the following way:
[latex-display]B(p)=\text{Person p's birthdate}[/latex-display]
Joan decides to survey people so she can make a plot of her birthday function. She started surveying people at the art opening she and Hazel went to, but didn't collect enough data. So, she also asks her Facebook friends (of which she has many) to send their birthdays. Some of the data she collected for May is in the table below.
| Name | Birthday |
| Homer | May 1 |
| Grandpa | May 2 |
| Mindy, Edward | May 3 |
| Jacob | May 4 |
| Greta , Maureen | May 5 |
| David | May 6 |
| Professor McGonagall , January Jones | May 7 |
| Travis | May 8 |
| Shelley, Shannon, Kelvin | May 9 |
| Brianne | May 10 |
| Thomas, Monica | May 11 |
| Fritz, Liam | May 12 |
Birthday Data for May