Question

of the last 18 trains to pull into castroville station, 12 were full. considering this data, how many of the next 12 trains would you expect to be full?

Explanation:

Step1: Calculate the proportion of full - trains

The proportion of full trains in the first 18 trains is $\frac{12}{18}=\frac{2}{3}$.

Step2: Predict the number of full trains in the next 12 trains

Multiply the proportion by the number of the next trains. So the expected number of full trains is $\frac{2}{3}\times12 = 8$.

Answer:

8