Matthew has a loyalty card good for a discount at his local hardware store. The item he wants to buy is priced at $13, before discount and tax. After the discount, and before tax, the price is $12.48. Find the percent discount.

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.