Chapter 16 Probability

- 0 to 1 ration: 0 events that will not take place, 1 a certain event
- P(event A) = favorable outcomes/total number of outcomes
- Either of two events: P(A or B) = P(A)+P(B)-P(A and B)
- Either of two mutually exclusive events: P(A or B) = P(A)+P(B)
* Little note: Prime numbers are divisable by one and itself

Example 1: Using a 52 card deck

a) P(black king) = 2/26 which reduces to 1/26

b) P(red face card) = 6/52 which reduces to 3/26

c) P(black or red card) = 52/52 which is 1

d) P(black diamond) = 0/52 which is 0

e) P(spade) = 13/52 reduces to 1/4

f) P(ace) = 4/52 reduces to 1/13


Example 2: Two die

a) P(sum of 2) = 1/36

b) P(the first die will be even number) = 18?36 reduces to 1/2

c) P(sum of -4) = 0/36 which is 0

d) P(factor of 40) = 4/6 reduces to 2/3

---Daniellee