Create Average within measures

Hi All,
I am wondering if its possible to get an average list of created measure.

Basically I have powerpivot flat table that have the following list :

List Measure1 Measure2 Measure3 Measure4 Measure5
aa 3 4 2 0 0
bb 2 1 8 4 2

Would like to have

List Measure1 Measure2 Measure3 Measure4 Measure5 Measure 6

aa 3 4 2 0 0 3
bb 2 1 3 8 2 4


Measure6 = avg( measure1:measure5)



Thanks all

Thanks..No we need to exclude the zero's - exclude the count. Otherwise it will be straight forward
i.e measure1 + measure2 +measure3 + measure4 /4.

Thanks -the Scott solution works