Discussion
A screen's effectiveness is the product of oversize recovery \( 0.94 \) and undersize recovery \( 0.88 \). Its overall effectiveness is
Answer: B
Correct answer: 0.827
Overall effectiveness is the product of the two recoveries:
\[ E = 0.94 \times 0.88 = 0.827 \]
Multiplying rather than averaging is the point: a screen must place both fractions correctly, so failing at either penalises the result. The distractor \( 0.910 \) is the arithmetic mean, which flatters a screen that does one job well and the other badly - precisely the case the combined measure exists to expose.
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