the calculated mean of 50 observations was 80.It Was later discovered that observation 19 was recorded by mistake as 91 .What was correct mean
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Given,
Mean of 50 observation = 80
We know that, Mean of ungrounded data is
Sum of observations/no. of observations
As given,
Sum of obs./no. of obs.= 80
Sum of obs./50 =80
Sum of obs. = 80×50
=4000
In the question,
19 is recorded instead of 91. so, we have to subtract 19 and and add 91 to the sum of observations
4000-19 =3981
3981+91 = 4072
So, the actual sum of observations is 4072
So now,.
Mean = sum of obs./no. of obs.
= 4072/50
= 81.44
I hope it helps you Pari
:-)
Mean of 50 observation = 80
We know that, Mean of ungrounded data is
Sum of observations/no. of observations
As given,
Sum of obs./no. of obs.= 80
Sum of obs./50 =80
Sum of obs. = 80×50
=4000
In the question,
19 is recorded instead of 91. so, we have to subtract 19 and and add 91 to the sum of observations
4000-19 =3981
3981+91 = 4072
So, the actual sum of observations is 4072
So now,.
Mean = sum of obs./no. of obs.
= 4072/50
= 81.44
I hope it helps you Pari
:-)
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