Question

The mean marks scored by 100 students are found to be 40. Later on, it was discovered that a score of 52 was misrcadas 83. Find the correct mean .
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Answer 1

Answer:

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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Answer 2

Answer:

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