Why is the answer "No" for the first question

imo there is no any form of propably causality. Beside trivial case (order 0 cones, sell 0 icecreams etc)

Hi - I think causality is the key here.  There is a relationship between the two events, however the one event occurring does not necessarily cause the other event to occur.  For instance, ordering a certain number of cones will not cause a certain number of ice creams to be sold.  In other words, the ordering of a certain number of cones does not mean that a certain number of ice creams will be sold as other factors (daytime temperature, shop location, flavors of ice cream) cause ice cream to be sold.