Final answer:
The number of downloads for one song is three fifths of the other song's downloads, which can be demonstrated mathematically with a proportional equation. A hypothetical dataset shows that these values are linearly related. Data about song lengths in an album collection gives additional information but isn't directly related to downloads or movie usage.
Step-by-step explanation:
The question involves using proportional reasoning to deduce the relationship between the number of downloads for two different songs. If one song had about three fifths the number of downloads of another song, we can represent the relationship with an equation. Let's assume that the second song had x downloads, then the first song would have 3/5 * x downloads.
To create a sample dataset, we'll choose an arbitrary number for x, say 100 downloads (for the second song). Consequently, the first song would have 60 downloads, which is 3/5 of 100. If we graph these, we'd see a straight line passing through the origin, which means the subunits are related linearly.
In the example of the album collection, if there are a total of 43 songs on five albums and the length of songs is uniformly distributed from 2 to 3.5 minutes, this does not directly relate to the number of downloads or usage in movies. However, it provides useful data about the length of songs.