Computing Decile function on every nth row in a column

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Thank you. I see what is being done. However I'm trying to compute the Decile function on every nth row, without further manipulation of the data. As background, I'm running a monte carlo analysis and capturing 3 kinds of output data with each iteration (using 1000) passes resulting in a column with 3000 rows. Each pass is copied pasted to a separate place. To-date, I've been running macros to "pluck" every nth row item and then using plain excel functions on that fresh column of data. But this is kind of labor-intensive and possibly prone to error. This is why I'm trying to run some kind of modified function to do a regular function on every nth row. Perhaps my sample file led you down this path. Sorry about that. What I'm trying to do is run a decile function on every nth row, where each nth row represents the data I want to compute the decile function on. Is this possible?