No.

Strata/Firm

Economic Sector

Total Number

Sample size (30%)

Number

Sample size used (50%)

Number used

01

ETS OLIVE-Minings

Wolframite-Cassiterire

21

6.3

6

10.5

11

02

ETS OLIVE Agriculture

Cinchona tree

26

7.8

8

13

13

03

CONGOCOM S.A.R.L

Wolframite-Cassiterite and Gold

33

9.9

10

16.5

17

04

NBB & Frères S.A.R.L

Colombo-Tantalite, Cassiterite, and Gold

26

7.8

8

13

13

TOTAL

106

31.8 = ±32

32

53

54