Dynamic Averaging Based On Adjacent Column?

I have a column with random values that are generated my my machinery.I should not sort them, because they provide me with the performance graph. Lets say i have column "A"

0
2
9
9.5
30
90
22
15
9
0

As the max value of this is 90, and its 10% of MAX is 9, which occurs at 3rd and 9 th positions.I need to find the average of its adjacent range, with zeros not considered.It has to calculate the max value in the column, find 10% of max and do average of adjacent column from the sl. no of first occurrence of 10% value in first column to the sl no of last occurrence of 10% value in first column.

the exact 10% value may not always exist. 10% of 90 is 9, but if the max value is 94, the 10% would be 9.4 which doesn't exist. then it has to take the nearest available predecessor in that case.i get values in decimals mostly and only some of them are perfect integers, thus this consideration goes with it,and also, my range actually is B14:B10013

i would most probably have the 10% value within the first 50 "non zero" entries and reoccurring somewhere probably within the last 50 "non zero" entries.