Answer
0.135
Work Step by Step
Looking for: probability train is missed today (late class is guaranteed if he misses his train)
P(miss train | late class) = P(late class and miss train) / P (late class)
P(miss train | late class) * P (late class) = P(late class and miss train)
0.45 * 0.30 = P(late class and miss train)
= 0.135
