The mean of 100 observations is 45. If it was later found that two observations 19 and 31 were
incorrectly recorded as 91 and 13. The correct mean is(Can u answer me along with explanation)
A) 43.64
B) 44.46
C) 45.63
D) 44.64
Answers
Answered by
2
Answer:
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
Answered by
1
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
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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