The mean age of 30 students in a class is 20 years. It was later discovered that while calculating the mean, the ages of two students were wrongly taken as 21 and 20years instead of 25 and 19 years respectively. Find the correct mean.
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Answer:
Number of observations=100
Mean=40
Sum of values of observations=40×100
=4000
30 and 27 noted instead of 3 and 72
Correct sum=4000−30−27+3+72
=3982
Correct mean=
100
3982
=39.82
Step-by-step explanation:
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