average of three numbers in a list is 30.How much will be the increase in the average when 70 is added to the list
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average of 3 number is x+y+z/3= 30
total sum of no 3×30 = 90
we added 70 and 90
70+90=160
then n =4
average = 160/4=40
total sum of no 3×30 = 90
we added 70 and 90
70+90=160
then n =4
average = 160/4=40
Dheeraj11111111:
why we will use n=4 at last
average of 3 no =30 and 4th number is 70
ok
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