i too need help for paper 5s, but i do know about the anamolous points.
the points which are the furthest from the rest will be considered anamolous, ya you can have 2 points, but when explaining you have to write about both, because this answer will be checked according to your graph, so if you have 2 anamolous points, you write about them. yes the anamolous points are not included when calculating average.