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 288 millimeters with a standard deviation of 51 mm. For pompano, the mean is 129 mm with a standard
deviation of 40 mm. Stewart caught a bluefish that was 321 mm long. What was the z-score for this length?
A)0.65
B)321
C)6.29
D)4.8

Question

Quizplus · Accepted Answer

The z-score is calculated by subtracting the mean from the observed value and then dividing by the standard deviation. For Stewart's bluefish, $ z = \frac{321 - 288}{51} = \frac{33}{51} = 0.65 $.

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