Erica goes to the carnival. the admission cost is $5 . each game ticket is $.50 . erica can spend no more than $20 at the carnival . write an inequality that represents the number of game tickets she can buy .solve and graph

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.