Question

the mean of 40 observations was 200. it was detected on rechecking that the value of 65 was wrongly copied as 25 for computation of mea.Find the correct mean. ​

Answer 1

Answer:

8040 is the correct mean

Step-by-step explanation:

Given

Number of observations= 40

Mean= 200

Mean= Sum of the observations/Number of the observations

200=Sum of the observations/40

200x40= Sum of the observations

8000=Sum of the observations

Wrong observation=25

Therefore, 8000-25

= 7975

Correct observation=65

Therefore, 7975+65

= 8040

Hence, 8040 is the correct mean

Hope it helps!!