What the average Frequency, when Types are "Norteño", and when Brand "La Cotorra"?
Frequency Callsign Brand City of License Type
List of radio stations in Tamaulipas
17982829
real text text text text
2-17982829-17
AM
AM
580 XEHP La Mas Prendida Ciudad Victoria Norteño
640 XETAM La Poderosa Santa Elena Norteño
970 XEBJ-AM Radio 970 Ciudad Victoria Contemporary
1340 XERPV-AM La Cotorra Ciudad Victoria Norteño
1380 XEGW Planeta W 1380 Ciudad Victoria Christian Pop
1480 XEVIC Radio Tamaulipas Ciudad Victoria State Government
SELECT AVG Frequency FROM table WHERE Type = norteño AND Brand = la cotorra
norteño la cotorra