Question

The mean of 20 observations of marks is found to be 40. Later on, it was discovered that one of the marks, 53 was misread as 83. Find the correct average of the marks.

Answer 1

Answer:

Step-by-step explanation:

Corrected mean =sigma x + correct value -incorrect value upon no.of observations

Mean=Sigma X upon No.of obs.

40=sigma X upon 20

Sigma X = 800

Corrected mean = 800 +53-83 upon 20

Corrected mean =853-83 upon 20

Corrected mean=38.5

Hope this helps....