The sum of deviations of n numbers from 10 and 20 are a, b respectively. If \frac{b}{a} = -4, then what is the mean of these n numbers ?

UPSC CDS 2 2023 Math Paper

Question : 9 of 100

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The sum of deviations of n numbers from 10 and 20 are a, b respectively. If ‌

= -4, then what is the mean of these n numbers ?

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