Question

The mean of 10 numbers is 55. If one no. is excluded , their mean becomes 50. Find the excluded no.

Plz answer

Answer 1

Mean = sum of observations / no of observations
55 = sum of all observations / 10
Sumof all observations = 550

Now after excluding one number
50 = sum of all observations / 9
Sum of all the observations= 450.

Thus, the excluded number = 550 - 450 = 100.

Answer 2

I hope this helps you....