We can see in the diagram that we have 6 options at the beginning, if we want to roll a number less than 4 then we have to take the following options: 1,2 and 3. So, the probability of the first event is 3/6 or 1/2 after simplifying. Then we have four options (4 colors G=Green,B=Blue,R=Red,Y=Yellow) for the second event. If we want to land on red the probability will be 1/4. Since they are independent events, the probability of both events will be the multiplication of the probabilities. So, the answer would be:
Since 1/8 is equal to 0.125 it cannot be considered as an unusual event as the probability is greater than 0.05.
The answer of the first part is 0.125
The answer of the second part is B.