the mean of marks scored by 100 students was found to be 60. Later on it was discovered that a score of 42was misread as 53. Find the correct mean?
Answers
Step-by-step explanation:
Mean score = 60
mean=sum of observation /no of observations
sum of observations = mean x no of observations
that is 60 x 100
= 6000
after replacement, sum of new observation=6000-83+53
=5970
mean of new observation = 5970/100
=59.7
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Step-by-step explanation:
no of students = 100
mean given = 60
mean=sum of observations/no of observations
60=sum of observations/100
sum of observations=6000
6000-53+42 = 6000-11 = 5989
actual mean = 5989/100 = 59.89
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