probability module 9

Question

You roll a 6-sided die. What is the probability that you will roll either a 3 or a 4?=



You flip a 2-sided coin. What is the probability that you will get either heads or tails?=

Answer 1

Pr(1) = 1/6

Pr(2) = 1/6

Pr(3) = 1/6

Pr(4) = 1/6

Pr(5) = 1/6

Pr(6) = 1/6

Pr(3 or 4) = 1/6 +1/6 = 2/6 = 1/3 = 33 1/3% chance of 3 or 4

Pr(H) =1/2

Pr(T) = 1/2

Pr(H or T) = 1/2+1/2 = 1 = 100% certain it will be Heads or Tails

unless it rolls and lands on its edge, neither heads or tails