| No. of years of schooling of farmers | $0$ | $2$ | $4$ | $6$ | $8$ | $10$ | $12$ |
| Annual yield per acre in $‘000 (₹)$ | $4$ | $4$ | $6$ | $10$ | $10$ | $8$ | $7$ |
| No. of year of schooling (X) | $\text{x}=(\text{X}-\overline{\text{X}})$ | $x^2$ | Annual yield (Y) | $\text{y}=(\text{Y}-\overline{\text{Y}})$ | $y^2$ | $xy$ |
| $0$ | $-6$ | $36$ | $4$ | $-3$ | $9$ | $18$ |
| $2$ | $-4$ | $16$ | $4$ | $-3$ | $9$ | $18$ |
| $4$ | $2$ | $4$ | $6$ | $-1$ | $1$ | $12$ |
| $6$ | $0$ | $0$ | $10$ | $3$ | $9$ | $0$ |
| $8$ | $2$ | $4$ | $10$ | $3$ | $9$ | $6$ |
| $10$ | $4$ | $16$ | $8$ | $1$ | $1$ | $4$ |
| $12$ | $6$ | $36$ | $7$ | $0$ | $0$ | $0$ |
| $\Sigma\text{X}=42$ | $\Sigma\text{x}=0$ | $\Sigma\text{x}^2=112$ | $\Sigma\text{Y}=49$ | $\Sigma\text{y}=0$ | $\Sigma\text{y}^2=38$ | $\Sigma\text{xy}=42$ |
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Demand schedule for commodity- X of individual A and B is given in the following table. Derive the market demand schedule and market demand curve.
| Price of Commodity-X (₹) | Demand of A (Units) | Demand of B (Units) |
| 1 | 9 | 7 |
| 2 | 7 | 6 |
| 3 | 6 | 5 |
| 4 | 4 | 4 |
| 5 | 3 | 3 |
|
District
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
Wheat
|
12
|
10
|
15
|
19
|
21
|
16
|
18
|
9
|
25
|
10
|
|
Rice
|
22
|
29
|
12
|
23
|
18
|
15
|
12
|
34
|
18
|
12
|
|
Elpenditure (in ₹)
|
0-10
|
10-20
|
20-30
|
30-40
|
40-50
|
|
Number of Families
|
15
|
?
|
27
|
?
|
15
|
|
Classes
|
Frequencies
|
|
20-40
|
3
|
|
40-80
|
6
|
|
80-100
|
20
|
|
100-120
|
12
|
|
120-140
|
9
|
|
|
50
|
