The mean of 50 observations was 40

The mean of 50 observations was 40. It was found later that an observation 45 was wrongly taken as15 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 #56032