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

Question

Quizplus · Accepted Answer

To calculate the z-score, we use the formula z = (x - mean) / standard deviation. For Stewart's bluefish, the z-score is (313 - 285) / 54 = 0.52. Therefore, the correct answer is B.

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