(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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?

2. Relevant equations

P(|x1-x2|>5)

Any ideas? Many thanks :)

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# Homework Help: Normal distribution head-scratcher

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