A student food the mean of 50 items as 38.6. When checking the work he found that he had taken one item as 50 why it should correctly read as 40 in this circumstances. What should be the correct mean?

Correct result:

m =  38.4


n=50 m1=38.6 m=(n m150+40)/n=(50 38.650+40)/50=1925=38.4

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