Consider the following premises. David is not a sailor. If Michael were a scientist, then David is a sailor. If it is windy, then Michael is a scientist. Can we infer the following from them? It is not windy.
 From the fact that if it is windy, then Michael is a scientist, and that if Michael were a scientist, then David is a sailor we can infer that if it is windy, then David is a sailor. Finally, from the fact that if it is windy, then David is a sailor, and that David is not a sailor we can infer that it is not windy. Therefore, the answer is yes.