Mathematics, 18.12.2019 17:31 JOEFRESH10
previously, 2% of mothers smoked more than 21 cigarettes during their pregnancy. an obstetrician believes that the percentage of mothers who smoke 21 cigarettes or more is less than 2% today. she randomly selects 160 pregnant mothers and finds that 2 of them smoked 21 or more cigarettes during pregnancy.
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