The propensity interpretation: Some probabilities are just out there in the world. It’s a brute fact about coins that they come up heads half the time; we’ll call this the coin’s physical “propensity towards heads.” When we say the coin has a 50% probability of being heads, we’re talking directly about this propensity.
Worst case example: Associated idea: we’ve had too many heads, now we’re going to get some tails. Action taken by someone counting: disregarding future heads, so the measurement can show a perfect 50⁄50 split.
Worst case example: Associated idea: we’ve had too many heads, now we’re going to get some tails. Action taken by someone counting: disregarding future heads, so the measurement can show a perfect 50⁄50 split.