If you want to find the number of outliers (points above a given threshold, e.g. 10.0), you could use the expression:
length(delete(W1, W1 < 10.0))
If you want to identify the mean and standard deviation of those outliers, generate the series of outliers:
delete(W1, W1 < 10.0)
and take the MAX and STDEV of the resulting series.