- #1
Mglafas
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Homework Statement
A study investigates the performance of students in an exam, which is known to follow a normal distribution, with a mean of 63 and a standard deviation of 21.
What is the probability that the difference between two randomly selected
students is more than 5 marks?
Homework Equations
P(|x1-x2|>5)
Any ideas? Many thanks :)