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Normal Distribution Question

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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Reply 1

ghostwalker

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.

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.

Reply 2

nadinelia11

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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