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Spearman's Rank Coefficient The IQ of per...
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Solution When c=12, we have IQ=m12×100=25m3 ∴ 80≤IQ≤140⇒80≤25m3≤140 ⇒ 80≤25m3 and 25m3≤140 ⇒ 325×80≤m and m≤140×325 ⇒ 485≤m and m≤845 ⇒9.6≤m≤16.8 Hence, the required mental age for a group of 12-year children is 9.6 years or more and 16.8 years or less.
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