Yamkini (kutoka Kiarabu يمكن yumkinu = inawezekana; kwa Kiingereza probability) ni kadirio la fursa au uwezekano wa kutokea au kutotokea kwa tukio fulani. Kuna tawi la hisabati linaloshughulikia swali hili. Mfano: kwa kutumia hisabati ya yamkini unaweza kuonyesha ya kwamba ukirusha sarafu hewani mara 10 italala mara 5 kwa kuonyesha namba na mara 5 kwa kuonyesha nembo upande wa juu. Fomula ya yamkini ni P=F/C. P ni yamkini, F ni idadi ya matukio yanayopendekezwa, C ni jumla ya matukio yanayoweza kutokea. Kallenberg, O. (2005) Probabilistic Symmetries and Invariance Principles. Springer -Verlag, New York. 510 pp. ISBN 0-387-25115-4 Kallenberg, O. (2002) Foundations of Modern Probability, 2nd ed. Springer Series in Statistics. 650 pp. ISBN 0-387-95313-2 Olofsson, Peter (2005) Probability, Statistics, and Stochastic Processes, Wiley-Interscience. 504 pp ISBN 0-471-67969-0. Virtual Laboratories in Probability and Statistics (Univ. of Ala.-Huntsville) Kigezo:In Our Time Probability and Statistics EBook Edwin Thompson Jaynes. Probability Theory: The Logic of Science. Preprint: Washington University, (1996).