A DeltaPresenceEstimationHistogramBucket message with the following
values: min_probability: 0.1 max_probability: 0.2 frequency: 42 means
that there are 42 records for which δ is in [0.1, 0.2). An important
particular case is when min_probability = max_probability = 1: then,
every individual who shares this quasi-identifier combination is in
the dataset.
.. attribute:: min_probability
Between 0 and 1.
Number of records within these probability bounds.
Total number of distinct quasi-identifier tuple values in this
bucket.
