Question
On a test given to 900 students, the mean grade was 72.7, with a standard deviation of 8.56. Assuming a normal distribution, estimate the following.
On a test given to 900 students, the mean grade was 72.7, with a standard deviation of 8.56. Assuming a normal distribution, estimate the following.
a)The number of students who got a B grade, (between 70 and79).
b)The number of students who got an C grade, (between 60 and 69).
c)The number of students who scored more than 90.
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Concepts of Database Management
Authors: Philip J. Pratt, Mary Z. Last
8th edition
1285427106, 978-1285427102
