Question

7. The mean of the 100 observations
is 45. It was later found that
two observations 19 and 31 are
incorrectly recorded as 91 and 13.
find the correct mean​

Answer 1

Answer:

19+31=50÷2=25=original mean

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Answer 2

Given that,

But two numbers (19+31 = 50) were incorrect

So, net sum = 4500 - 50 = 4450

Add correct numbers (91+13 = 104)

⇒ 4450 +104 = 4554

⇒ new mean = 4554/100 = 45.54