Dice Sum Probabilities and The Normal Distribution

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How does one find the error of a sum of four or five 6-sided dice probability distribution in relation to the Normal Distribution?

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Personally, I would start by just plotting the exact pdf and the normal approximation, shown for 5 dice, below:

Normal approximation

Then if you want to examine the errors more closely (defined as the exact value minus the approximation), I would plot those too.

Errors in approximation

Notice the vertical scale--the errors are fairly small.