Magnetize to 6717
If you take a full trading session—roughly 390 minutes on U.S. indices—the exact bar that will become the low of the day is one out of those 390.
That means the baseline probability of selecting the right minute at random is 1/390, or about 0.26 %.
If you require that the call is made during that bar (not after), the probability collapses further, because…




