Secondary Education reported that 7.5% of school going teenagers has a drug problem. A by the Schools Psychological Services department in the Ministry of Primary and boarding master at a certain school wished to investigate this statement. In his sample of 20 teenager students: a) How many would you expect to have a drug problem? What is the standard deviation? [5 b) What is the likelihood that none of the students sampled has a drug problem? [3]
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