Question

Please Help!
The sample space of an experiment is [A,B,C,D] and P(A)=0.1, P(B)=0.3, P(C)=0.4, P(D)=
a.)0.3
b.)0.4
c.)0
d.)0.2

Answer 1

All the probabilities in the sample space must add up to 1.
\[P(A)+P(B)+P(C)+P(D)=1~~\implies~~P(D)=1-0.1-0.3-0.4=?\]