a)
Ω = {ω = (ω1,ω2) : ωn ∈{M,J}
A1 = {ω ∈ Ω : ω1 = J, ω2 = J}
A2 = {ω ∈ Ω : ω1 = J, ω2 = M}
A3 = {ω ∈ Ω : ω1 = M, ω2 = J}
A4 = {ω ∈ Ω : ω1 = M, ω2 = M}
p(A1) = p(A2) = p(A3) = p(A4) = 1/4 = 0.25
p(mindestens ein J) = p(A1) + p(A2) + p(A3) = 0.75
b)
p(A1, unter der Bedingung mindestens ein J) = 0.25/0.75 = 1/3
c)
Ereignismenge E={A1,A2}, p(ω2 = J) = 1/2