Mary sells lemonade, and she donates 10 cents from every cup she sells to charity. the cups of lemonade sell for 45 cents. one day she made $17.10. how much money did she give to charity that day?

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.