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