Table:
0
A
B
C
D
1
order id
product id
order quantity
order items
2
14
2
5
3
5
2
9
4
14
3
2
5
2
2
9
6
13
1
9
7
10
1
5
8
10
3
6
9
7
2
9
10
14
3
8
11
10
2
5
12
10
2
9
13
11
2
1
14
10
3
6
15
8
1
7
16
8
2
5

Questions and formulas:
Question: What's the mean order quantity?
Formula: AVERAGE(C1)
Formula2: AVERAGE(C2:C16)
Level: easy