If the average of (p, q), (q, r) and (r, s) is 5.8, 1.4 and 0.7 respectively. Find the value of (p - 2r - s).
Correct Answer: Option D
We know that,
\(Average\ of\ some\ entities = {{sum\ of\ the\ entities} \over {number\ of\ the\ entities}}\)
Given, \({{p + q} \over 2} = 5.8\) ⇒ p + q = 11.6 ……… (i)
Also, \({{q + r} \over 2} = 1.4\) ⇒ q + r = 2.8 ……… (ii)
And, \({{r + s} \over 2} = 0.7 \Rightarrow\) r + s = 1.4 …………….. (iii)
From operation, [(i) – (ii) – (iii)] we get,
⇒ p + q - q - r - r - s = 11.6 - 2.8 - 1.4
⇒ p – 2r - s = 7.4
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