Knowing the probability of throwing a certain dice score can often be the difference between success or failure in gaming terms- or dictate whether you include a certain weapon or wargear item in your list.
The chart shown below illustrates the probability of combined dice scores from 4 dice. The red figure under each red bar represent the 4d6 combined dice score; the white figures above each bar show the possible combinations for each dice score; the figures along the bottom of the chart are the mathematical probabilities of achieving each score.
So we can see that the score of 14 has the most throwing combinations (146), and you have a 11.27% chance of throwing this score.
Remember- this chart is based on the results of many thousand dice throws- in the real world these probabilities vary slightly. So keep these figure in mind as a rough guide only.

Example
If you need to calculate the probability of throwing
a particular score or above, simply add up all the
percentages from the score required upwards to the
highest score. We can see that if a Deathwing Sergeant
wants to make his Auspex earn its points he will
need to throw 18+ on 4d6. The probability of him
achieving this is:
6.17 + 4.32 + 2.70 + 1.54 + 0.77 + 0.31 + 0.08
= 15.89% (or roughly
1 in 6.3).
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