Table:
0
A
B
C
D
E
F
1
Call sign
Frequency MHz
City of license
ERP W
Class
FCC info
2
W238AW
95.5
West View, South Carolina
55
D
FCC
3
W242BX
96.3
Greenville, South Carolina
100
D
FCC
4
W289AO
105.9
Anderson, South Carolina
27
D
FCC
5
W216BJ
91.1
Wando, South Carolina
10
D
FCC
6
W220CN
91.9
Charleston, South Carolina
10
D
FCC

Questions and formulas:
Question: What is the ERP W number where the frequency is smaller than 91.1?
Formula: SUM(FILTER(D1, B1<91.1))
Formula2: SUM(FILTER(D2:D6, B2:B6<91.1))
Level: easy