In a class of 30 students, 29 of them took an exam in class and 1 student took a make-up exam the following day. The professor graded the first batch of 29 exams and found an average score of 75 points with a standard deviation of 5.9 points. The student who took the make-up the following day scored 60 points on the exam. To find the new average I added 75 to 60 then divided by 2 to get 67.5 and the question says to round two decimal places so I made it 68 and I got it incorrect.

Question

In a class of 30 students, 29 of them took an exam in class and 1 student took a make-up exam the following day. The professor graded the first batch of 29 exams and found an average score of 75 points with a standard deviation of 5.9 points. The student who took the make-up the following day scored 60 points on the exam. To find the new average I added 75 to 60 then divided by 2 to get 67.5 and the question says to round two decimal places so I made it 68 and I got it incorrect.

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