1. The average of 13 results is 70. The average of first seven is 65 and that of the last seven is 75, the seventh result is:
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By: anil on 05 May 2019 02.19 am
Average of 13 results = 70 => Sum of 13 results = $$13 imes70=910$$ Similarly, sum of first seven = $$7 imes65=455$$ And sum of last seven = $$7 imes75=525$$ $$ herefore$$ Seventh result = $$(455+525)-910=70$$ => Ans - (A)
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