This is just a slight modification of a question I asked earlier. Thanks to all the responders.
 
I have a data set(Bill) of with 1 variable (var1), with 100 obs that are in ascending order. I want to sample every 10 observations and save them in 10 different groups such as   Group1 is obs 1-10  Group 2 is obs-11-20 .... Subset data into the 10 groups, then calculate the mean/0.8 of var1 for each of the 10 groups. 
The mean/0.8 is the modification. Thanks.
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