A bowl of flower seeds contains 5 petunia seeds

Assuming that this is the complete question : a bowl of flower seeds contains 5 petunia seeds and 15 begonia seeds. Riley calculated the probability that a randomly selected seed is petunia seed as 1/3. Describe and correct Riley's Error.

Answer:

Riley is wrong because the probability of a randomly selected seed is petunia is 1/4.

Total petunia seeds : 5

total all seeds : 20

Probability = 5/20 = 1/4