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