Problems #1 and #2

Using an "Addiction" dataset, a researcher has prepared the following table of patient counts:

Ethnicity Age Category Alcohol Cocaine Heroin Row Total Black Old 30 48 17 95 Young 25 72 13 110 Hispanic old 7 0 5 12 Young 8 7 19 34 White Old 60 2 17 79 Young 26 10 34 70 Column Total 156 139 105 400