the mean of 20 no is 18 if 3 is added to first ten no find the new set of 20 no
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x/20=18-----eq1
x+30/20------eq2
put x=360 in
mean =390/20
mean=19.5
x+30/20------eq2
put x=360 in
mean =390/20
mean=19.5
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Total of 20 numbers 20 *18=360
3 is added to first 10 numbers
Hence the total is increased by30
New total is 360+30=390
New average =390/20=19.5
3 is added to first 10 numbers
Hence the total is increased by30
New total is 360+30=390
New average =390/20=19.5
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