For part d, I know that I am supposed to use 190, 125 and 85 to calculate the frequencies. Shouldn't it be the relative frequency for types, not four locations if we are using row total? I am confused why it is row total but the frequency is for location not type. Please explain. thanks.

Location North East South West Totals 20 40 80 50 190 Type 50 40 10 25 125 30 20 10 25 85 TOTALS 100 100 100 100 400 a. How many experimental units are included in the analysis? b. How many experimental units are located in the north? c. How many experimental units of type B are located in the west? d. Use row totals to calculate relative frequencies for the four locations