Fred Anderson an artist has recorded the number of visitors who visited his exhibit in the first 8 hours of opening day He has made a scatter plot to depict the relationship between the number of hours and the number of visitors Number of Visitors at Exhibit Number of Visitors O21 18 O 1 16 14 12 10 00 6 4 2 0 0 1 2 How many visitors were there during the fourth hour 3 4 5 Number of Hours 6 7 8 9