If M is the mean of x,y,z ; then what is the mean of 3x,3y and 3z
Choices:
A) M
B) 3M
C) 10M
D) M+10
E) M-10
So new mean is 3M   Answer (3M)
<result>B</result>
If M is the mean of x,y,z ; then what is the mean of 3x,3y and 3z