The mean of 17 data is 20. If the mean of first 9 data is 23 and the last 9 is 18, find the 9th data
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Mean of 17 data=20
Thus the total=17×20=340
Mean of 1st 9=23
Total=9×23=207
Mean of last 9=18
Total =9×18=162
162+207=369
In this counting the 9th term is counted 2 times...
Thus 9th term=369-340=29
Thus 9th data is 29
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