According to the frequency histogram, the frequency of products weighing more than 5 10g is 0.0 1× 5 = 0.05.
∴ from N×0.0 1×5=3, n = 60.
(ii) All possible values of ξ are 0. 1.2,
The quantity of products with weight greater than 505g is 60× (0.05× 5+0.01× 5) =18 pieces.
p(ξ= 0)= c 2 13c 2 18 = 355 1，
p(ξ= 1)= c 1 13c 15c 2 18 = 5 17，
p(ξ= 2)= c25c 2 18 = 15 1，
The list of ∴ξdistribution is:
? ξ? 0? 1? 2? p？ 355 1? 5 17? 15 1∴eξ=0×355 1+ 1× 155 1+2× 15 1= 13.