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The average of 21 data is 36 out of which the first 12 data are having an average of 15. The average of the rest 9 data is:
given that the average of 21 data is 36
$$\frac{\left(sum\ of\ data\right)}{21}$$=36
sum of the data =756
given that the average data of 12 data is 15
i.e;sum of the data= 180
average of rest 9 data is
$$\frac{\left(756-180\right)}{9}$$=64
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