Mean of n numbers is p .... Multiple Choice Question

S_100

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Sep 27, 2019
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1631477655887.pngAnswer is A but I am unsure how to tackle this question.



I wrote the mathematicaal expressions for each sentence but I am unsure where to go from there.
 

Jomo

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Dec 30, 2014
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Let the n numbers be a1, a2, a3, ...., an.
Then the average would be (a1+a2+...+an)/n = p

The mean of a1 and a2 is q. That is (a1+a2)/2 = q. So how much is a1+a2

The remaining numbers have a mean of (a3+a4+...+an)/(n-2) = 10. How much is a3+a4+...+an?

Continue from here. 1st find out what a1+a2+...an equals in terms of n, p and q.
 
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