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S2 Normal Approximation Question

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    Hey, so i've been doing a past paper for Edexcel S2 and i came accross this question:

    The random variable T has the normal distribution N(25, 5^2).
    (c) Find P(T ≤ 18).

    I went and did this question but on the mark scheme, no continuity correction was shown and im not sure why

    it just did (18 - 25) / 5

    Any idea why that may be? or is the mark scheme wrong?

    Thanks
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    It doesn't look like they're approximating T from a discrete distribution to a continuous distribution. They've defined T as having a continuous distribution, so there is no need for a continuity correction.
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    (Original post by Zhy)
    It doesn't look like they're approximating T from a discrete distribution to a continuous distribution. They've defined T as having a continuous distribution, so there is no need for a continuity correction.
    oh yeah LOL im silly, i shoulda realised that. Thanks for the help

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Updated: April 5, 2012
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