Ajar contains 6 red jelly beans 4 green jellys beans and 4 blue jelly beans if we choose a jelly bean then another jelly bean without putting the first one back in the jar what is the probability that the first jelly bean will be blue and the second will be blue as well?

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.