Ty borrowed $500 from his parents. the graph shows how much he owes them each month if he pays back a certain amount each amount each month. how long will it take ty to pay back his parents?

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.