Missing value for the mean.

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A professor has recorded exam grades for 10 students in his class, but one of the grades is no longer readable.  If the mean score on the exam was 81 and the mean of the 9 readable scores is 84, what is the value of the readable score?

Oct 10th, 2015

Thank you for the opportunity to help you with your question!

total number of students=10

grade that don't exist = x

then, mean of 10 students = 81, so total score = 81*10 = 810

mean of 9 students = 84, so total score of 9 students= 84*9 = 756

value of missing score = 810 - 756 = 54

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 10th, 2015

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Oct 10th, 2015
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