Question

the arithmetic mean of 10 observation was calculated as 100 .in doing so an observation was wrongly taken as 50 instead of 15. what would be the correct mean?​

Answer 1

Step-by-step explanation:

Will you send me 10th question

Answer 2

Step-by-step explanation:

Mean = (Sum of all observations)/(Number of observations)

or, 40 = (Sum of all observations)/10

So, sum of all observations = 400

But this is incorrect sum, since one observation was copied wrongly.

So, correct sum = Incorrect sum – Incorrect observation + correct observation

= 400 – 15 + 45

= 430

Correct Mean = Correct Sum/ Number of observations

= 430/10

= 43