Question

the mean of marks scored by under students was found to be 40 later on it was discovered that the score of 53 was misread as 83 find the correct mean

Answer 1

Hope it helps....!!!!

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✔️Given mean marks of 100 students = 40

✔️Sum of marks = 100 × 40 = 4000

✔️Given that one observation is misread as 53 instead of 83

✔️Hence error in reading the marks = 83 – 56 = 30

✔️Correct sum of observations = 4000 – 30 = 3970

✔️Correct mean = 3970/100 = 39.7

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Answer 2

no. of students not given bro. check the question