Final answer:
In 'Because of Mr. Terupt', the class can spend a day in the snow if the school closes due to snow exceeding three inches. While other scenarios could also close the school, the book specifies snowfall as the condition for closure and thus for an outdoor snow day.
Step-by-step explanation:
In the book Because of Mr. Terupt, the class is able to spend a day outside in the snow when it snows more than three inches. This is because when it snows more than three inches, the schools are mandated to close. Thus, the occurrence of such a snow event allows the class to spend time outside. It's important to note that while a closure due to snow is a necessary condition for them to spend a day outside, there might be other reasons for school closures such as power outages or extreme weather conditions other than snow. However, within the context of these specific premises, if schools have indeed closed, and we know that the mandated rule is for closures when snow exceeds three inches, we can conclude that it must have snowed more than three inches in this instance.