- The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?
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Answer:78
Step-by-step explanation:
given that average of total = 17*60
= 1020
average of first 9 result is = 9*57
= 513
average of last 9 result is = 9*65
= 585
as 9th result is calculated two times.
then value of 9th result = average of first 9 r +average of last 9 -average of total
⇒9th result = 1020-513-585
=78
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