Class A recorded 22, 20, 16, 22, 20 and Class B recorded 10, 15, 16, 13, 16 (in a maths quiz out of 30). Find the mean for each group, and state which group had the higher mean.

Kea recorded 21, 23, 15, 25, 16 and Tui recorded 24, 19, 27, 22, 23 (goals in their last 5 netball games). Find the mean for each group, and state which group had the higher mean.

Room 5 recorded 16, 14, 13, 24, 18 and Room 7 recorded 8, 16, 20, 17, 19 (books read this term). Find the mean for each group, and state which group had the higher mean.

Mia's scores in five rounds of a spelling competition were 11, 31, 33, 33, 34, and Sione's were 11, 19, 10, 20, 28. Find the range for each, and state whose results were more consistent (the smaller range).

Ruby's times in seconds for five 100 m sprints were 30, 29, 23, 11, 34, and Tane's were 21, 13, 39, 26, 36. Find the range for each, and state whose results were more consistent (the smaller range).

Ana's marks in five weekly science tests were 28, 10, 17, 32, 36, and Nikau's were 27, 21, 27, 24, 32. Find the range for each, and state whose results were more consistent (the smaller range).

Ruby recorded 29, 36, 26, 30, 24 and Tane recorded 31, 30, 30, 21, 23 (pages read each day over 5 days). Find the mean for each, and the difference between the two means.

Year 9 recorded 18, 14, 20, 21, 17 and Year 10 recorded 13, 12, 11, 20, 19 (minutes of homework each night over 5 nights). Find the mean for each, and the difference between the two means.