The mean of marks scored by 100 students was found to be 40. Later on it was discovered that a score of 53 was misread as 83. Find the incorrect mean.How do you so,ve this?
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Answer:
39.70
Step-by-step explanation:
Mean=40
Total students=100
Sum of frequency (let say 'X')
therefore,
X= (mean)(total students)
X = 40*100=4000.
X = 83+sum of other 99 score.
4000-83=sum of other 99 score.
3917= sum of other 99 score.
but actually,
sum of all frequency is (53+sum of other 99 score.)
sum of all frequency =3970.
therefore
new mean= 3970/100
39.70.
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