The mean of 10 numbers is 20 . If 5 is subtracted from every number , what will be the new mean.

Asked by Madan Gupta | 29th Mar, 2017, 07:11: AM

Expert Answer:

begin mathsize 16px style Given space that space the space mean space of space 10 space numbers space is space 20.
So comma space the space sum space of space 10 space numbers space equals space 10 cross times 20 equals 200
If space 5 space is space subtracted space from space every space number comma space the space sum space becomes space 200 minus left parenthesis 10 cross times 5 right parenthesis equals 150
So comma space the space new space mean equals 150 over 10 equals 15 end style

Answered by Rebecca Fernandes | 29th Mar, 2017, 08:49: AM