Is a fraction considered a improper fraction when the fraction has a smaller denominator n numerator

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.

Interpret the following expression (5y^2-7)^3/(2y)^2

Rounded to the nearest tenth, what is the value of x