NO

Total SOHFOs (N)

Sampled SOHFOs

% of the total sample

NO X

79

79/286 * 167 = 46

27.6

NO Y Point A

82

82/286 * 167 = 48

28.7

NO Y Point B

82

82/286 * 167 = 48

28.7

NO Y Point C

21

21/286 * 167 = 12

7.2

NO Y Point D

22

22/286 * 167 = 13

7.8

Total

286

167

100