mean of 50 obs. was found to be 80.4 but later on it was found that 96 was misread as 69 at one place . find the correct mean

**Given: **Mean of 50 observations = 80.4

⇒ Sum of 50 observations = 80.4 × 50 = 4020

Now Actual sum = sum of 50 observations + correct observation – Incorrect observation

= 4020 + 96 – 69 = 4047

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