The mean of 15 measurements was calculated to be 50 cm. But it was found that one of the measurements was recorded as 46 cm instead of 61 cm. What is the correct mean (in cm)?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 51
The mean of the 15 measurements = 50
We have given that one of the measurements was recorded as 46 cm instead of 61 cm.
So the difference in the mean = (61 - 46)/15 = 1
So, one should be added to the old mean = 50 + 1 = 51