Chart representation

[tenyeapen]

Hi Guys, I'm new to this qlikview and have a doubt in the graphical representation.

I need to show a trend chart showing the RAG status of average of the TAT for each Department on a monthly basis

I have below data with me.

TAT                             Department                         Month

[dplr-rn]

maybe there is some hidden compelxity. but follow below steps
add Month , Department as dimension and expression avg(TAT)