Table:
0
A
B
C
D
E
F
1
Romanised name
Chinese name
age at appointment
Foreign nationality
Portfolio attachment
Govt salary
2
Chan Chi-yuen, Paul
陳智遠
28
N/A
Food and Health
HK$ 134,150
3
Cheung, Raymond Man-to
張文韜
46
N/A
Education
HK$134,150
4
Choy Siu-min, Linda
蔡少綿
37
N/A
Environment
HK$149,055
5
Lo Yik-kee, Victor
盧奕基
55
British
Security
HK$134,150
6
Mok Yee-tuen, Zandra
莫宜端
35
N/A
Labour and Welfare
HK$134,150
7
Ng Kit-shuen, Katherine
伍潔鏇
34
an Singapore
Financial Services and the Treasury
HK$163,960
8
Tsui Ying-wai, Caspar
徐英偉
31
Canadian
Home Affairs
HK$134,150
9
Yip Kan-chuen, Frankie
葉根銓
38
N/A
Financial Secretary
HK$134,150
10
Young Chit-on, Jeremy
楊哲安
32
British
Food & Health
HK$134,150

Questions and formulas:
Question: What is the average age at appointment of those attached to security?
Formula: AVERAGEIFS(C1,E1,"security")
Formula2: AVERAGEIFS(C2:C10,E2:E10,"security")
Level: easy