Questions 7.7-7.70: fractures and hemispherical projection 42347.10 A borehole of orientation 136/55 intersected six fractures belong-
ing to the same sub-parallel set, the orientations of which were 201/39,
213/50, 215/63, 230/52, 247/42 and 253/28. Compute the mean orienta-
tion of the set,
(a) without accounting for sampling bias, and
(b) accounting for sampling bias.