Export file size is different from the original raw size

Could someone explain to why, when the original size of a raw file in a folder is about 11mb. But when in Lightroom is shows about 7.1mb. When I export it to a jpeg the size becomes around 3.5mb.
I know that sRAW1 file is 7.1mb as stated in the book. But why does it go down to about 3.5mb when exported to jpeg.
Is there a way to export it to the a higher size? Like 7.1
I used sRAW1 in a canon 50D.
Thanks,
Ray

The "actual" size of you images file is measured by this basic formula, 8-bits is one byte. Each pixel has one byte for the Red, one byte for the Green, and one byte for the Blue colour channels. So, we have 3 bytes per pixel. Multiply the total number of Mega Pixals of your camera's sensor by 3 and you have the true size of an 8 bit image file.
How this image will end up in a final file size depends upon the amount of compression you choose to apply.
The more complex the image, the harder it is to compress without some degradation of image quality. So the original size of an image will not always be a guide to its size when compress. For instance an image with little or no sharpening applied will compress to a much smaller size than the same image with a large amount of sharpening even though the same compression settings were used on export.
If you wish to resize your images on export from LR in specific megapixals (and therefore MB's) then LR/Mogrify has this functionality.
There is a nice simple explanation of this here

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Export file size is different from the original raw size

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