Question

mean of 10 number is 55 . if one number is excluded the mean is 50 . find the excluded number

Answer 1

mean= sum/10=55
sum=550; y is unknown no
(sum-y) /9=50
sum-y=450
550-450=y
y =100

Answer 2

ANSWER...................,

The mean of 10 number = 55

The sum of 10 number = 10 × 55 = 550

If one number is excluded ,

Then mean of 9 number = 50

Sum of 9 number = 9 × 50 = 450

∴excluded number = 550 - 450 =1 00