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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Step-by-step explanation:
total results of 13 =13×70
=910
total results of first seven=7×65
= 455
last seven results=7×75. =525
7th results=525+455-910
70
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