I think it means improper
In "the open window" by Saki. The character Framton decides to go to the Stappletons' house to relax because he has been extremely nervous and believes the countryside will help him relax. Framton waits for Mrs.. Sappleton but Vera comes first and they start a conversation in which he discovers about the tragedy. This works as a contradiction to his expected outcome and actually makes him even more nervous.
The whole incident goes against what Framton expected, therefore is considered a situational irony.
The phrase in which that contradiction seems reflected from Framton Nuttel's perspective is: "She rattled on cheerfully about the shooting and the scarcity of birds, and the prospects for duck in the winter. To Framton it was all purely horrible."
I believe it’s A “happiness only real when shared”
0.4825 estimated is 0.5 because the 8 makes the four round up to 0.5