excel - Average of TextBoxes that are not blank -

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i need average of 5 textboxes there chance of them may empty. if so, should consider filled textboxes. have code find sum of couldn't succeed in finding average:

 tot = tot + cdbl(textbox117.text)  tot = tot + cdbl(textbox118.text)  tot = tot + cdbl(textbox119.text)  tot = tot + cdbl(textbox120.text)  tot = tot + cdbl(textbox121.text)  textbox70.text = tot

i tried counting number of boxes still couldn't result.

dim arr, long, n long, t double, v arr = array(textbox117, textbox118, textbox119, textbox120, textbox121)   n = 0 t = 0 = lbound(arr) ubound(arr)     v = trim(arr(i).text)     if len(v) > 0         t = t + cdbl(v)         n = n + 1     end if next  textbox70.text = t textbox71.text = t/n

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