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Normal Distribution Question watch

1. Hey, am just starting to revise some of the statistics for my exam an came across this question Im a tad uncertain of.

I just don't really know what to do with it. I of course have the formula for the distribution but surely it cant expect me to calculate probabilities for 1 to 16 and then do the inverse?

I've not faced many questions on this distribution so any help is greatly appreciated.
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2. (Original post by Eremor)
Hey, am just starting to revise some of the statistics for my exam an came across this question Im a tad uncertain of.

I just don't really know what to do with it. I of course have the formula for the distribution but surely it cant expect me to calculate probabilities for 1 to 16 and then do the inverse?

I've not faced many questions on this distribution so any help is greatly appreciated.
This is a continuous distribution. You need to find how far 16 is from the mean in terms of standard deivations and then use the tables for the normal distribution.
3. From what I can remember, this I what I would do:-
We know x ~ n(9, 7 squared)
We need to find z, which I believe is z= 1-9 all over 7 (not sure if this is 100% correct but there is a formula???maybe google it). Work this out and then look up on tables

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...
Correct. Standard normal distribution.

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Updated: December 30, 2014
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