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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Chetan070804
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)
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€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