help in math may june 2010

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http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_43.pdf
Q 7 a plzz help

 

[Max]

mode = 11
Median = 12.5 ( Sum of Fx/ Sum of f) ( fx = no. of book borrowed x number of members)
For mean, hard to explain here!

 

[IGCSE O/L student]

mode = 11
Median = 12.5 ( Sum of Fx/ Sum of f) ( fx = no. of book borrowed x number of members)
For mean, hard to explain here!

u jst xplained mean: Sum of Fx/ Sum of f. ans is 12.8