College students and surfers Rex Robinson and Sandy Hudson collected data on the self-reported numbers of days surfed in a month for 30 longboard surfers and 30 shortboard surfers.

Longboard: 4, 9, 8, 4, 8, 8, 7, 9, 6, 7, 10, 12, 12, 10, 14, 12, 15, 13, 10, 11, 19, 19, 14, 11, 16, 19, 20, 22, 20, 22

Shortboard: 6, 4, 4, 6, 8, 8, 7, 9, 4, 7, 8, 5, 9, 8, 4, 15, 12, 10, 11, 12, 12, 11, 14, 10, 11, 13, 15, 10, 20, 20

a. Compare the typical number of days surfing for these two groups by placing the correct numbers in the blanks in the following sentence:

The median for the longboards was ________ days, and the median for the shortboards was ________ days, showing that those with ________ boards typically surfed more days in this month.

b. Compare the interquartile ranges by placing the correct numbers in the blanks in the following sentence: The interquartile range for the longboards was __________ days, and the interquartile range for the shortboards was __________ days, showing more variation in the days surfed this month for the __________ boards.