the avaerage of 17 numers is 15.If the average of first 9 numbers is 14 and that of last number is 16 find the middle number
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Average of 15 numbers = 18
Sum of 15 numbers = 15×18 = 270
Average of first 8 numbers =19
Sum of first 8 numbers = 19×8 =152
Average of last 8 numbers =17
Sum of last 8 numbers =17×8 =136
8th number = Sum of first 8 +Sum of last 8 - total sum
=152+136−270
=18
#khushu☺️
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