Re-did it with the question

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.

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Adele is five years older than timothy. in three years, timothy will be 2/3 of adele’s age. what is adele‘s current age?