Standard Deviation - Calculation with condition

[jaango123]

Hi all,

Could anyone please help us in the formula to calculate "Stdeviation of Good" and "Average of best(least value considered the best) 90% of Good" columns, in the attched excel sheet?
Stdeviation of Good - the standard deviation of Good.
Average of best(least value considered the best) 90% of Good - It should calculate the average, of first and best and Good 90% of the 'value', where least value is considered to be best.

[arthurbr]

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