Carmen spent $18 on fruit at the grocery store. she spent a total of $45 at the store. what percentage of the total did she spend on fruit?

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.