Carmen wants to add to her menu by selling BLT sandwiches. How much should she charge for the BLT sandwich if she would like to make between 35 − 40% profit on each BLT? Show how you know your pricing is correct.

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.