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# S2 Normal Approximation Question Watch

1. 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
2. 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.
3. (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

Updated: April 5, 2012
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