Which of the scatter plots have no correlation check all that apply

What is the most accurate measurement of 1 pound

Is the power produced directly proportional to the wind speed, give reasons for your answer?

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.