Aschool nursing staff wants to estimate the average weight of girls in the seventh grade as part of the school's stay fit program. they measured the weights of 5 girls from each of the 10 seventh-grade classes. the mean of the data was 91 pounds, and the median was 87 pounds. which prediction matches the data? a. about one-half of the girls weigh more than 91 pounds. b. the average weight of the girls is 87 pounds. c. about one-half of the girls weigh more than 87 pounds. d. the average weight of the girls is 91 pounds.