Mean of 100 observations is 45. It was later found that two observations 19 and 31 were incorrectly recorded as 91 and 13 . Find correct Mean ( using Assumed Mean Method )
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Step-by-step explanation:
Mean = 45
100
x
=45⇒x=4500
Two number (91+13)=104 incorrect
So let sum = 4500 – 104 = 4396
Add correct number 19+31 = 50
= 4396+50 = 4446
Mean =
100
4446
=44.46
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