According to Dr. Peter AGM DeSmidt of the Netherlands if an herb cause an adverse reaction in one and 1000 users a traditional healers would have to...

According to Dr. Peter AGM DeSmidt of the Netherlands if an herb cause an adverse reaction in one and 1000 users a traditional healers would have to treat 4800 patients with that herb i.e. one new patient every single working day for more than 18 years to have a 95% chance of observing the reaction more than one user verify this calculation by Friday the probability of observing more than one person or one reactions in 4800 patients give me that one in 1000 has a reaction