Unit: throbability3. I
.Basic Terminology
,probability
① Irobability = likelihood ( O f p f l )IO
t
Too-
- o. I ← 10% → low likelihood 0% 400%go
← 90% → more likely to happenTo = 0.9
② Sample space = set of all pogies outcomes
Ex : take COVID- 19 test → f positive , negative }
exe : how many siblings do you have → { O, I,2 , 3
,. . .}
2×4③ Trial = a process or action with a sample space
Ex : take the COVID - 19 test
exe: roll a dice → Sp = { I,2. 3 .
4, 5, G }
sample space④ Event = situation where the trial has a particular outcome
Event A = A Champaign resident tests positive for AVID- 19
ICA) = probability that A happens
Ex : Event B = roll a dice and outcome is 1
I (B) = prob. of getting 1 while rolling a dice
=I6