Question

The mean of marks scored by 50 students was found to be 39 later on it was discovered that the score of 43 was misread as 23 find the correct mean​

Answer 1

Answer:

39.4

Step-by-step explanation:

First find the sum of observations by multiplying mean and number of observations. This is 1950 initially.

Then subtract the wrong observation (1950-23)

Add the correct observation (1950-23+43). This comes out to be 1970.

Now divide by 50

The New mean is 39.4