Table:
0
A
B
C
D
E
1
C_{low}
C_{high}
I_{low}
I_{high}
Category
2
0
12.0
0
50
Good
3
12.1
35.4
51
100
Moderate
4
35.5
55.4
101
150
Unhealthy for Sensitive Groups
5
55.5
150.4
151
200
Unhealthy
6
150.5
250.4
201
300
Very Unhealthy
7
250.5
350.4
301
400
Hazardous

Questions and formulas:
Question: How many different C_{high} values are there for the good category?
Formula: ROWS(FILTER(B1,E1="Good"))
Formula2: ROWS(FILTER(B2:B7,E2:E7="Good"))
Level: easy
Question: What's the C_{high} when the C_{low} value is 250.5?
Formula: FILTER(B1,A1="250.5")
Formula2: FILTER(B2:B7,A2:A7="250.5")
Level: easy
Question: What's the i_{high} value when C_{low} is 250.5?
Formula: MIN(FILTER(D1,A1="250.5"))
Formula2: MIN(FILTER(D2:D7,A2:A7="250.5"))
Level: easy
Question: What's the C_{low} value when C_{high} is 12.0?
Formula: FILTER(A1,B1="12.0")
Formula2: FILTER(A2:A7,B2:B7="12.0")
Level: easy
Question: In how many different categories is the value of C_{low} 35.5?
Formula: ROWS(FILTER(E1,A1="35.5"))
Formula2: ROWS(FILTER(E2:E7,A2:A7="35.5"))
Level: easy