(willing to give 30 points! picture included)
i am super stuck on this one and i really need with this problem a the moment, i would appreciate it so much.

joel surveyed 13 classmates to find out the number of days it had been since the last time they were at a grocery store.

a. what was the median number of days represented on joel's plot?

b. what is the interquartile range of number of days represented on joel's plot.

c. by how much does the mean of joel's second data set change in comparison with the mean of the data set in his original survey? explain how to determine the change in means without calculating the mean of either data set.

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.