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Ishaan scored 68 in Physics (class mean 60, SD 5) and 75 in Chemistry (class mean 65, SD 8). In which subject did he do relatively better?

Competition practiceStatistics

APhysics $(z = 1.6)$
BChemistry $(z = 1.25)$
CChemistry, since 75 > 68
DEqually well in both

Step-by-Step Solution

z

(Physics)

= \frac{68 - 60}{5} = 1.6

;

z

(Chemistry)

= \frac{75 - 65}{8} = 1.25

. The higher

z

-score means a better relative standing: Physics.

Answer: A) Physics

(z = 1.6)

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