Assuming your data is in C2:C4 which it surely wont be
The following array formula will give you what you want
=AVERAGE(IF(ISTEXT(C2:C4),VALUE(RIGHT(C2:C4,LEN(C2:C4)-1)),C2:C4))
Enter this with Ctrl Shift Enter
Gives me 2.344333333
Adjust range to suit
or slightly shorter
=AVERAGE(IF(ISTEXT(C2:C4),1*SUBSTITUTE(C2:C4,"<",""),C2:C4))