If M is the mean of x,y,z ; then what is the mean of x+20,y+20 and z+20
Choose the correct choice from the following options:
A) M B) 3M C) 10M D) M+20 E) M-10
If each number is shifted up by 20, the mean also shifts up by 20 since it stays in the middle. The whole set is shifted on the number line so mean will also shift by the same amount.   So new mean is M + 20.   Answer (M+20)
<result>D</result>
If M is the mean of x,y,z ; then what is the mean of x+20,y+20 and z+20