Answer:
[tex]\frac{1}{6}[/tex]
Step-by-step explanation:
Probability is typically given in the form of a fraction where the denominator is the total number of outcomes and the numerator is the number of desired outcomes. Since both of these events, picking a marble and flipping a coin, are independent (one doesn't rely on the other), we can find each of their probabilities and multiply them:
[tex]\frac{yellow}{marbles}=\frac{1}{3}[/tex]
[tex]\frac{head}{heads/tails}=\frac{1}{2}[/tex]