Valerie and bret have a total of 24 dog show ribbons. bret has twice as many ribbons as valerie. how many ribbons does each have?

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.