The mean of 15 observations was 25

The mean of 15 observations was 25. It was found later that an observation 40 was wrongly taken as 25. The corrected new mean is

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #65163