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From: Uwe Brauer <oub@mat.ucm.es>
Subject: Re: problem with empty column
Date: Sat, 06 Jan 2018 09:43:45 +0100
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>>> "Michael" == Michael Brand <michael.ch.brand@gmail.com> writes:

Hi Michael
   >  if(typeof(vmean($1..$7)) == 12, string(""), vmean($1..$7); E

This is precisely what I was looking for, thanks a lot. I meanwhile
circumvent the problem by

| Name   | E1 | E2 | E3 | E4 | Pre | Res |
|--------+----+----+----+----+-----+-----|
| Entry1 |    |    |    |    |   0 |  NP |
| Entry2 | 10 | 20 | 30 | 40 | 100 |  10 |
| Entry3 | 10 |    | 20 | 30 |  60 |   6 |
#+TBLFM: $6=$2+$3+$4+$5::$7=if("$2" == "nan", string("NP"),$6/10);E


But your solution is much more elegant.