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Possible Duplicate:
Statistics Probability

I'm trying to figure out the steps needed to solve this problem:

A survey of adults ages $18-24$ found that $38\%$ get no news on an average day. You randomly select $250$ adults ages $18-24$ and ask them if they get news on an average day.

  1. Find the probability that at least $113$ people say they get no news on an average day.

    For this, I am finding $np$, $npq$, and then adding $.5$ to find the $z$-score. It never comes out right.

  2. Find probability that fewer than $93$ people say they got new news on an average day.

Thank you.

  • 0
    To _what_ are you adding $0.5$ to find the $z$-score? and how is this question very different from [this one](http://math.stackexchange.com/q/93254/15941) that you asked just a short while ago?2011-12-21

1 Answers 1