ANSWER:
b)29/30
STEP-BY-STEP EXPLANATION:
When two events are exclusive, we can apply the following formula:
[tex]\begin{gathered} P\mleft(AorB\mright)=P(A)+P(B) \\ P(A)=\frac{2}{3} \\ P(B)=30\text{\% }=\frac{30}{100}=\frac{3}{10} \end{gathered}[/tex]We replace and calculate the P(A or B):
[tex]\begin{gathered} P(AorB)=\frac{2}{3}+\frac{3}{10}=\frac{2\cdot10+3\cdot3}{3\cdot10}=\frac{20+9}{30} \\ P(AorB)=\frac{29}{30} \end{gathered}[/tex]