Fixed norm_cdf
Fixed norm_cdf


Former-commit-id: 442d2992c1ebdb4a0637a400c5a7b5665ee02a96 [formerly 66dbbb55a4a3272f3c1df93149278327a1c05790]
Former-commit-id: e9f9a5d2f135c57a3471745862df16486046caf6
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine