Question

The mean of 10 no. Is 55. If one no. Is exclu9,their mean becomes 50. The excluded no. Is

Answer 1

Hey!!!!

__________

Given, mean of 10 numbers = 55

Sum of 10 numbers = mean x 10

=> Sum of 10 numbers = 550

Again mean of 9 numbers = 50

Sum of 9 numbers = mean x 9

=> Sum of 9 numbers = 450

Difference in sum = 550 - 450

=> Difference = 100

Thus the excluded number was 100

_____________

Hope this helps ✌️

Legally Good Morning :-)

Answer 2

Mean = (sum of observations)/(no. of observation)

==========================

=> Mean of 10 numbers = sum of 10 numbers)/10

=> 55= (sum of 10 numbers)/10

=> 55×10 = sum of 10 numbers

=> 550 =sum of 10 numbers



============================

When 1 number excluded,

=> Mean = (sum of 50 numbers - excluded number)/(49)

=> 50 = (550- excluded number)/9

=> 50×9= 550-excluded number

=> 450 = 550-excluded number

=> 550-450 = excluded number

=> 100 = excluded number



Excluded number is 100


I hope this will help you


-by ABHAY