document.write( "Question 859818: About 4% of the scientists in the National Academy of Sciences believe in PSI (parapsychology such as psychokinesis, telepathy, and astral projection). At a convention 157 members show up. Let X be the number of scientists at the convention who believe in PSI. You may assume for the following questions that X is binomially distributed with parameters n=157 and p=0.04.\r
\n" ); document.write( "\n" ); document.write( "(a) How many scientists at the convention do you expect do believe in PSI? Answer\r
\n" ); document.write( "\n" ); document.write( "(b) What are the chances that none of the scientists at the convention believes in PSI? Answer\r
\n" ); document.write( "\n" ); document.write( "(c) What are the chances that at least 4 scientists at the convention believe in PSI? Answer\r
\n" ); document.write( "\n" ); document.write( "(d) What is the standard deviation of X? Answer \n" ); document.write( "

Algebra.Com's Answer #517965 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "p = .04, n = 157
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document.write( "(a) How many scientists at the convention do you expect do believe in PSI?  = approximately 7
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document.write( " (b) What are the chances that none of the scientists at the convention believes in PSI? 
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document.write( " (c) What are the chances that at least 4 scientists at the convention believe in PSI? 
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document.write( " (d) What is the standard deviation of X? \n" );
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