In this task, you need to provide the correct option for a given problem on probability from the provided options.
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Question: Problem: a certain junior class has 3000 students and a certain senior class has 800 students . among these students , there are 60 siblings pairs each consisting of 1 junior and 1 senior . if 1 student is to be selected at random from each class , what is the probability that the 2 students selected will be a sibling pair ? 
Options: a ) 1 / 40000 , b ) 1 / 3600 , c ) 9 / 2000 , d ) 1 / 60 , e ) 1 / 15

Answer: a


Question: Problem: in a certain animal population , for each of the first 3 months of life , the probability that an animal will die during that month is 1 / 10 . for a group of 300 newborn members of the population , approximately how many would be expected to survive the first 3 months of life ? 
Options: a ) 219 , b ) 246 , c ) 252 , d ) 262 , e ) 270

Answer: a


Question: Problem: lola rolls a die 3 times . what is the probability that she gets a 4 on the last one of the 3 rolls ? 
Options: a ) 215 / 216 , b ) 216 , c ) 1 / 216 , d ) none , e ) 2

Answer:
a