The range is the inteval including all possible answer.
Boys' answers range from 3 to 10, whereas girls' anwers range from 5 to 9. So, the range is greater for the boys, because
[tex]10-3=7>4=9-5[/tex]
As for the average, we have to sum all results and divide by the number of results:
[tex]A_{boys} = \dfrac{3+6+7+7+8+8+8+8+9+10}{10} = 7.4[/tex]
[tex]A_{girls} = \dfrac{5+6+6+6+7+7+7+8+9}{10} = 6.1[/tex]
