<p>OK, so I have been taking practice tests, and tests in my book and the given answers all fluctuate wildly for how digits are shown. I took a collegeboard practice test and they showed 6 (!) digits after the decimal point. In my CliffsAP, they usually show 3 after the decimal point but sometimes show 4 for probabilities when they are expressed as decimal and not percent (Eg. 0.1235, 0.9938). What is the correct format?? People always say 3 but then why would the collegeboard themselves use 6 in the solution? Can you get penalized? And would you round, say a probability of 0.999996 to 1.000, even though that would incorrectly suggest that the event always happens?</p>
<p>I intend to use 4 digits after the decimal point. I am almost certain they do not take off points for that.</p>
<p>I think they are supposed to design the problems so that these kinds of things are avoided and the answers are mostly cut and dry.</p>
<p>I wouldn’t worry about it as long as you leave 3+ you should be fine.</p>