Suppose it has been observed that an average of six vehicles passes by their house per minute on Wednesday mornings. Zia counted the number of passing vehicles on a Wednesday morning. If no less than...

Suppose it has been observed that an average of six vehicles passes by their house per minute on Wednesday mornings. Zia counted the number of passing vehicles on a Wednesday morning. If no less than three vehicles pass by their house in a minute, she will give her mother a new fashion watch. Otherwise, she will give her a pearl necklace. What is the probability that Zia will choose the pearl necklace?