Question

please don't fake and tell correct answer ​

Answer 1

Answer:

let sum of obs be x

so given x/40=100

so x=4000

now given 53 is misread as 83

so from the sum we subtract 83 and add 53

4000 -83+53

4000-30

3970

now new mean will be

3970/100

397/10

39.7 is new mean

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