Question

find both questions ? please

Answer 1

11):-
Mean =(x1+x2+x3---x10)/10

20=(x1+x2-----x10)/10

200=(x1+x2------x10)

If five is subtractred from every number, it means (10*5=50) is subtracted from the sum of observations

Then, new mean =(200-50)/10

New mean =150/10

New mean =15

12):-
Mean =(x1+x2-----x10)/10

36={x1+x2---x10)/10.

360=(x1+x2----x10)

If one number is excluded,

Then, sum of observations =360-y

36=(360-y)/9

324=360-y

y =360-324

y=36