joint density function

22 LETTERS · STARTS WITH J

joint density function is a valid 22-letter word worth 36 points in Scrabble and 43 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

J8O1I1N1T1D2E1N1S1I1T1Y4F4U1N1C3T1I1O1N1

8 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 1 + 1 + 4 + 0 + 4 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =36 PTS

DOUBLE WORD → 72TRIPLE WORD → 108

MEANING

What does joint density function mean?