Table:
0
A
B
C
D
E
F
1
Year
Animal
Artist
Finish
Mintage
Issue Price
2
2007
Ruby-Throated Hummingbird
Arnold Nogy
Specimen (with selective colouring)
25,000
$24.95
3
2007
Red Breasted Nuthatch
Arnold Nogy
Specimen (with selective colouring)
25,000
$24.95
4
2008
Downy Woodpecker
Arnold Nogy
Specimen (with selective colouring)
25,000
$24.95
5
2008
Northern Cardinal
Arnold Nogy
Specimen (with selective colouring)
25,000
$24.95
6
2010
American Goldfinch [ disambiguation needed ]
Arnold Nogy (reverse), Susanna Blunt (obverse)
Specimen (with selective colouring)
14,000
$24.95

Questions and formulas:
Question: How many Red Breasted Nuthatch coins created before 2007 were minted, on average?
Formula: SUM(FILTER(E1, (B1="red breasted nuthatch")*(A1<2007)))
Formula2: SUM(FILTER(E2:E6, (B2:B6="red breasted nuthatch")*(A2:A6<2007)))
Level: easy
Question: What year was the downy woodpecker coin created?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="downy woodpecker"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,B2:B6="downy woodpecker"),1))
Level: medium
Question: Which artist created coins before 2010?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1<2010),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,A2:A6<2010),3))
Level: medium