Each summer track and field athletes from all over the world represent their country by competing in the Sekai Games At the end of last year s games the official record keeper counted the number of gold medals won by each country in that year s games The histogram below summarizes the data Use the histogram to answer each of the questions Frequency Number of countries 10 9 8 7 6 5 4 3 2 3 to 6 7 to 10 11 to 14 Number of gold medals 15 to 18 a What is the class width b How many countries won 10 or fewer gold medals 0 c One class is the most frequent How many countries are in this class