Table:
0
A
B
C
D
E
F
1
Call sign
Frequency MHz
City of license
ERP W
Class
FCC info
2
WJYA
89.3
Emporia, Virginia
2,000
A
FCC
3
WPVA
90.1
Waynesboro, Virginia
2,500
B1
FCC
4
WOKG
90.3
Galax, Virginia
2,700
C3
FCC
5
WRXT
90.3
Roanoke, Virginia
5,500
C2
FCC
6
WPIM
90.5
Martinsville, Virginia
4,000
A
FCC
7
WOKD-FM
91.1
Danville, Virginia
18,000
C2
FCC
8
WPIB
91.1
Bluefield, West Virginia
12,000
C1
FCC
9
WPIN-FM
91.5
Dublin, Virginia
85
A
FCC

Questions and formulas:
Question: When the call sign is wpib, what is lowest ERP W?
Formula: MINIFS(D1,A1,"wpib")
Formula2: MINIFS(D2:D9,A2:A9,"wpib")
Level: easy
Question: Which class's call sign is wokg?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="wokg"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F9,A2:A9="wokg"),5))
Level: medium
Question: The frequency 89.3 belongs to what class?
Formula: LET(query1,SUMMARIZE(E1,SUMX(B1)),FILTER(query1,CHOOSECOLS(query1,2)=89.3))
Formula2: LET(query1,SUMMARIZE(E2:E9,SUMX(B2:B9)),FILTER(query1,CHOOSECOLS(query1,2)=89.3))
Level: hard