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please help this probability and statistics questions with clear steps and details, thankss 7. The pharmaceutical company claims that its painkillers are effective for at

please help this probability and statistics questions with clear steps and details, thankss

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7. The pharmaceutical company claims that its painkillers are effective for at least 116 minutes. The medical school of a university collected the data of 100 patients after taking the painkiller in a recent survey, and the results are as follows: Effective time Class mark frequency (mm) (minus) 0

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