Question

Mean of 60 observations is 66. Later, it was found that an observation 24 was wrongly taken as 42. What is

the corrected mean? /no​

Answer 1

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Answer 2

Answer:

65.7

T. N of obs 66*60=3960,

Wrong 42-24=18,

Now 3960-18=3942,

Org obs =3942/6*10=65.7 ans