Mean of 5 no.s is 75 . If one no. is excluded from the data the new mean is 72 . Find the excluded no.
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Step-by-step explanation:
The arithmetic mean of a group of 75 observations was calculated as 27. It was later found that one observation was wrongly read as 43 instead of the correct value 53. Obtain the correct arithmetic mean of the data
Answer
Number of observations= 75
Mean=27
Sum of observations=75×27
Wrong value=43, Correct value=53
∴Correct sum=75×27−43+53
=75×27+10
Correct mean=
75
75×27+10
=27+
75
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The L.C.M of 150(6x²+x-1) (x-3)³ and 84(x-3)³ (8x²+14x+5) is
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