Mean of 100 numbers was found to be 50. But later on, it was observed that one of the number 150 was wrongly taken as 50. The correct mean is: 100
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X..../100=50
total sum= 100*50
sum=5000
new sum= 5000-50+150
=5100
new mean= sum/no. of numbers
5100/100= 51
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