The mean marks of 100 students were found to be 48. Later on it was discovered the marks obtained by a student 46 was missed as 64. Find the correct mean.
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Secondary School Math 5+3 pts
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 correct mean.How do you so,ve this?
Report by Angelmathew 17.02.2016
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Hannnnnnna
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mean score = 40
mean=sum of observation /no of observations
sum of observations = mean x no of observations
that is 40 x 100
= 4000
after replacement, sum of new observation=4000-83+53
=3970
mean of new observation = 3970/100
=39.7
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