Statistics Practice Test 1

Question : 14 of 37

Marks: +1, -0

The Mean mark of 30 students in a class is 58.5. Later on it was found that mark 75 was wrongly recorded as 57. Find the correct means.

57.4
57.5
58.9
59.1

Validate

Solution:

The mean marks of 30 students = 58.5
Total marks of 30 students = 58.5 × 30 = 1,755 marks
Found that 75 was wrongly recorded as 57
So, correct mean
= 1,755 + (75 - 57)
= 1,755 + 18 = 1,773
Mean

=1773/30=59.1

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