How do I find the size of my JPEG photos

I want to find the size of my JPEG photos so I know how many photos I can fit per GB on my flashdrive.
I know that my photos are in the "all images" section, on the left side  of my "Mcintosh HD" dialogue box, a box which contains just about everything in my computer.
I click on "all images" and then a list of all my photos show up in the dialogue box. Then I can click on a photo and it will show the photo, but not the size of the photo. I would like to know the size of my photos, ie how may MBs per photo. (Let's say I find out a typical photo I have has 2.3 MBs. Then I can divide 1000 by 2.3 and that gives me the number of photos per GB in my flash drive.)  Thanks.

I'm using iPhoto 11 Version 9.3.2
Highlight or open a photo. In iPhoto 11, at the bottom right there is an i/info tab.
Selecting info should give you a window similar to this.
As for the difference in file sizes there can be a few possibilities.
1) you may have periodically changed the resolution settings in the camera
2) you may have resized/scaled or edited the original photos

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