The relative frequencies of this data by row is
     150 cc   180 cc
Black 0.43 Â Â Â Â 0.57
Blue  0.47     0.53
Red  0.55      0.45
The table of values is given as:
     150 cc   180 cc
Black 18 Â Â Â Â Â Â Â 24
Blue  15        17
Red  26        21
Calculate the row total.
     150 cc   180 cc   Total
Black 18 Â Â Â Â Â Â Â 24 Â Â Â Â Â 42
Blue  15        17      32
Red  26        21      47
Divide each element by the row total
     150 cc   180 cc
Black 0.43 Â Â Â Â 0.57
Blue  0.47     0.53
Red  0.55      0.45
Hence, the relative frequencies of this data by row is
     150 cc   180 cc
Black 0.43 Â Â Â Â 0.57
Blue  0.47     0.53
Red  0.55      0.45
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