Ch 7 (probability) Formulas

Question 1

Combination

Answer 1

nCr= n!
———
r!(n - r)!

Question 2

Theoretical probability

Answer 2

# outcomes in sample space

Question 3

Complement

Answer 3

P(not E)= 1 - P(E)

Question 4

Experimental probability

Answer 4

     # of trials

Question 5

Probability of independent events

Answer 5

P(A and B)= P(A) • P(B)

Question 6

Probability of dependent events

Answer 6

P(A and B)= P(A) • P(B|A)

Question 7

Mutually exclusive events (when A and B is occurring)

Answer 7

P (A u B)= P(A) + P(B)

Question 8

Inclusive events (when A or B is occurring)

Answer 8

P(A u B)= P(A) + P(B) - P(A∩B)

Question 9

Permutation

Answer 9

nPr= n!
——–
(N-r)!