the mean of 10 numbers is 20 if 5 is subtracted from every number what will be the new mean
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sum of all no.s = 10 ×20 = 200
5 is subtracted from each no. that means 10×5=50 total 50 is subtracted
thus new sum of all no.s will be = 200-50=150
new mean = 150÷10 = 15
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