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the marks of 100 students in an examination are normally distributed with mean of 25 marks and a standard deviation of 10 marks...Asked by james
the marks of 100 students in an examination are normally distributed with mean of 25 marks and a standard deviation of 10 marks. Given that the pass mark is 20, estimate the number of students who passed the examination.
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Answered by
Alex
The normal distribution is N(25, 10).
P(X > 20) = .691
So approximately 69.1% passed the exam.
69.1% of 100 students is 69 students.
P(X > 20) = .691
So approximately 69.1% passed the exam.
69.1% of 100 students is 69 students.