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# Edexcel Stats 1 - Normal Distribution

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1. Hi guys! Was hoping to have help on a question... It's a regional paper, so cannot find it on Exam Solution. Would anyone give me a hand in explaining what to do with the following question, May 2013 (R)

The time, X minutes, taken to fly from London to another city has a normal distribution with mean μ minutes.
Given that P(X < μ – 15) = 0.35 (c) find P(X > μ + 15 | X > μ – 15).

Help would be very much appreciated! Thank you in advance
2. (Original post by DeafeningSilence)
Hi guys! Was hoping to have help on a question... It's a regional paper, so cannot find it on Exam Solution. Would anyone give me a hand in explaining what to do with the following question, May 2013 (R)

The time, X minutes, taken to fly from London to another city has a normal distribution with mean μ minutes.
Given that P(X < μ – 15) = 0.35 (c) find P(X > μ + 15 | X > μ – 15).

Help would be very much appreciated! Thank you in advance
Sketch a curve

If P(X < μ – 15) = 0.35 then by symmetry P(X > μ + 15) = 0.35 and by definition P(X > μ – 15) = 1 - P(X < μ – 15)

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3. (Original post by gdunne42)
Sketch a curve

If P(X < μ – 15) = 0.35 then by symmetry P(X > μ + 15) = 0.35 and by definition P(X > μ – 15) = 1 - P(X < μ – 15)

Posted from TSR Mobile
Ahh of course! Thank you so much, just couldn't get around that in my head haha. Much appreciated!

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