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# S3 Edexcel Central Limit Theorem Exercise 3D question 11 Watch

1. (Original post by Nikhilm)
From the attachment, P(X < 110) = 0.9. I will call this value x

and P(X > 110) = 0.1. I will call this value y.

Hence, x = 1-y , i.e. P(X < 110) = 1 - P(X > 110)

Same thing I did for my answer no?
definitely not !!
there reason I did so is because the probability is less than 0.5, no tables for that
look at another example where the probability is over 0.5 like in your example
2. (Original post by TeeEm)
definitely not !!
there reason I did so is because the probability is less than 0.5, no tables for that
look at another example where the probability is over 0.5 like in your example
OMG I'm such an idiot!!!

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3. (Original post by TeeEm)
definitely not !!
there reason I did so is because the probability is less than 0.5, no tables for that
look at another example where the probability is over 0.5 like in your example
Thank you so much, will rep when I'm on my computer!

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4. (Original post by Nikhilm)
Thank you so much, will rep when I'm on my computer!

Posted from TSR Mobile
all the best !!

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