I THINK you can click on the image to make it larger, but here it is... in Excel. : D Good idea. (I added the pinkness to make it pretty.)
1. Done. :D
2. Clusters are sometimes in the same plane, or the same distance away, so its easier to group them by their APPARENT brightness to compare them.
I THINK. XD I really don't know.. I tried to apply stuff, but I could be wrong. Brighter, yes, but have more red/less heat?
4. M45, right? : ) They're overall more bright.
5. M45 is brighter, and therefore younger. It's between a couple thousand years and a couple million years old (the color thing is at the bottom of this chart...) The higher the color index, the less bright the star is. 47 Tuc is about a million or a couple hundred million years old.
6. Because the clusters aren't in the right place?
REFLECTION: Some of the theoretical and "logic-based" questions are still challenging, like number 6.. I pretty much just guessed and have no idea. I could come up with other guesses, but I don't know if they'd be any better.
APPLICATION: We're learning all about classifying stars- this is just another exercise in solidifying some of the types of stars there are. Although its similar to the HR diagram, the arrangement and the criteria used to categorize the stars are different.