I don't know why it didnt' work. I just tested the following and it
worked fine. Apply bold formatting to the "M" of Mergefield
immediately to the right of the "3"

{ IF { MERGEFIELD V1Mean \# ##0.00 } "3"{ MERGEFIELD V1Mean \# ##0.00
\* Charformat }{ MERGEFIELD V1Mean \# ##0.00 }}