I need help with my math home I need answers

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

(: the two box-and- whisker plots below show the scores on a math exam for two classes. what 2 things do the interquartile range tell you about the two classes?

20 points! plz now and fast plzz im so over do! which measure will you calculate how much the babies' weights vary, on average, from their mean weight? thirteen babies were born in a hospital on the same day. the weights of the babies (in pounds) were 5.5, 6.4, 5.8, 8.1, 9, 7.6, 8.2, 7.2, 8.8, 6.6, 5.4, 7.7, and 6.9. a. mode b. interquartile range c. range d. mean absolute deviation e. quartile