Create a data model for the following: The chess clubs in the greater Boston area are organizing to increase tournament participation. The area has many clubs, and each club may have many members. A chess player may only belong to one club. Each club may sponsor many tournaments, and each tournament may have many sponsoring clubs. How many tables are needed

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?