Question

The mean of a set of numbers is 120. If each number is divided by4, then what
will be the new mean?

Answer 1

Step 1= Consider the no. of obs. as any no.

= no. of obs. = 3

Step 2= Consider numbers as variables.

= a+b+c = 120

3

Step 3= According to algebra, multiply 3 into 120

= a+b+c = 120×3=360

Step 4= Now consider a, b, c as any numbers whose sum is 360.

=110+120+130=360

Step 5= Now divide the set by 4.

= 110/4=27.5

120/4=30

130/4=32.5

Step 6= Find their mean.

= 27.5+30+32.5 = 90

4. 4

=22.5