HELP ASAP!! There are 20 students who started precalculus in 11th grade and 20 students who started precalculus in 12th grade. The first group has a mean final grade of 88% and the second group has a mean final scored of 81%. The line plot shows the difference after 15 randomizations. Determine the difference in the means of the two groups and whether the difference of means is significant based on the line plot. Explain your answer.

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?