Answer:
c.) 20%
Explanation:
•1/3 chnace of picking Strawberry flavor
•2/3 chance of picking a milkshake or cone serving
(1/3)*(2/3)=2/9=0.222...(approx.)=0.20=20%
Edit for more clarification:
If you have a situation where multiple outcomes are favorable ("or" statements) then you add the odds together. The customer here wouldn't have minded a milkshake or a cone, so we add their odds together to get 2/3.
If you have a situation where a specific combination of outcomes is favorable ("and" statements) then we multiply the odds. The customer would be getting a flavor and a type of serving, so we multiply the odds of each combination together.
(Note that this is technically a simplified version of the general formulas/equations for probabilities so if you go look them up on the internet they might include some other ideas.)