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**cassrl****Member**- Registered: 2012-10-03
- Posts: 4

Mean proportion of individuals is p=0.30, sample size is 25 from this population, what fraction will have a sample porportion of 0.20 or lower?

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,613

hi cassrl

Welcome to the forum.

I see you have posted several questions that involve the normal distribution. I have just written out some background on this for another poster and he was able to get the right answer.

You might find it helpful to view his post:

http://www.mathisfunforum.com/viewtopic.php?id=18183

The help for Q3 starts at post number 17.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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