Github user abalanonline commented on the issue:
https://github.com/apache/jmeter/pull/295
There are two methods for calculating percentile: Nearest Rank method and
Linear Interpolation Between Closest Ranks method.
Median equal to percentile 50 if interpolation method is used. But for
JMeter measuring purposes the nearest rank percentile should be used because
perc 90 gives the exact maximum time for 90% of tests and this is what JMeter
users are expecting.
This is why the median should be calculated separately (or we can implement
interpolation method and use it for particular median purpose).
By the way getPercentPoint method is [failing
also](https://gist.github.com/abalanonline/9b128faa67e2459b765c1ef56454684b). I
will raise a bug.
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