po starts a business selling dumplings at his local street fair. he spends $150 on startup costs (tent, stoves etc.) and $45 a week on materials. each week he makes $60. what is the minimum number of weeks it will take po to make a profit?
don't write anything stupid

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.