90 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency Relative Frequency 9 0 1 2 3 4 5 6 7 10 12 15 11 11 8 0.1111 0.1333 0.1667 0.1222 0.1222 0.0889 0.1556 Cumulative Frequency a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 4 times per week? 9 31 46 57 68 76 90 %​