The mean of 20 number is 18. if 3 is added to each of the first ten numbers. Find the mean
of the new set of 20 number.
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Let €x be sum of 20 numbers :
€x/20= 18
€x=160
Given that 3 is added to first 10 numbers ; the sum will be €x+30
New Mean = €x+30/20 (€x=160)
->160+30/20
-> 190/20
-> 8.5
€x/20= 18
€x=160
Given that 3 is added to first 10 numbers ; the sum will be €x+30
New Mean = €x+30/20 (€x=160)
->160+30/20
-> 190/20
-> 8.5
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