Gina and Stewart Are Surf-Fishing on the Atlantic Coast, Where

Multiple Choice

Gina and Stewart are surf-fishing on the Atlantic coast, where both bluefish and pompano are common catches. The mean length of a bluefish is 285 millimeters with a standard deviation of 54 mm. For pompano, the mean is 128 mm with a standard deviation of 24 mm.
Stewart caught a bluefish that was 313 mm long. What was the z-score for this length?

A) 313
B) 0.52
C) 7.71
D) 5.8