Answer:
P(A or B) = 0.7
Explanations:
The given general addition rule for probability is given as:
[tex]P(A\cup B)=P(AorB)=P(A)+P(B)-P(AandB)[/tex]
Given the following parameters
P(A) = 40% = 0.4
P(B) = adult has a pet = 50% = 0.5
P(A and B) = adults have children and pet = 20% = 0.2
Substitute the given parameters into the formula;
[tex]\begin{gathered} \text{ P(A or B) = 0.4 + 0.5 - 0.2} \\ \text{ P(A or B) = 0.9 - 0.2} \\ \text{ P(A or B = 0.7} \end{gathered}[/tex]
Therefore the probability P(A or B) is 0.7
