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The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occurred in one of the measurement which was recorded as 64 cm., but should have been 61 cm. The correct average must be –
- A. 53 cm
- B. 54.5 cm
- C. 55.85 cm
- D. 56.15 cm
Answer: Option C
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