Originally Posted by BDW
It's a best guess calculation (statistics) based on some "known" info.
Here's something based on colors and models for Challenger
Example:
955 R/T convertibles built
Plum crazy was most popular color at 22.2%
So best guess is there were 955 x 22.2% = 222 Plum Crazy R/T convertibles built that year.

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Those are one line item row numbers from Chrysler.

I believe the OP is referring to combining multiple row of options. There are other individual option reports that chart an option per body and/or model type. Then mis-using statistics with bad reasoning.