dynamic chart title

[Pomna]

I need help setting up dynamic chart title. I need the title to show customer satisfaction rating for last month like below

May: 4.5

June: 4.75

Below is my code

To get the month 
NUM('date(AddMonths(Today(), -2),'MMM')  

To get customer satisfaction rating
Sum({<[CusSat Date]={'>=$(=MonthStart(Today(), -1))<=$(=MonthEnd(Today(), -1))'}>} [CusSat Rating])
/
Count ({<[CusSat Date]={'>=$(=MonthStart(Today(), -1))<=$(=MonthEnd(Today(), -1))'}>} [CusSat Rating]),'##.00'))

I need to combine both codes to get  May: 4.5

[jwjackso]

Try:

=date(AddMonths(Today(), -2),'MMM')&':'& 

NUM(Sum({<[CusSat Date]={'>=$(=MonthStart(Today(), -1))<=$(=MonthEnd(Today(), -1))'}>} [CusSat Rating])
/
Count ({<[CusSat Date]={'>=$(=MonthStart(Today(), -1))<=$(=MonthEnd(Today(), -1))'}>} [CusSat Rating]),'##.00'))

[Pomna]

Thanks for your reply but it does not solve my issue. I still get an error

[Pomna]

Thank you Jwjackso,

I removed the column and I of the closing brackets and it worked. Below is the code

=date(AddMonths(Today(), -1),'MMM')&' '&
NUM(Sum({<[CusSat Date]={'>=$(=MonthStart(Today(), -1))<=$(=MonthEnd(Today(), -1))'}>} [CusSat Rating])
/
Count ({<[CusSat Date]={'>=$(=MonthStart(Today(), -1))<=$(=MonthEnd(Today(), -1))'}>} [CusSat Rating]),'##.00')

Thank you