document.write( "Question 1158050: Among persons donating blood to a clinic 80% have Rh+ .A sample of 15 people who donate blood at the clinic on a particular day.
\n" ); document.write( "---Find the mean and the standard deviation of the number of people with Rh+
\n" ); document.write( "• Mean=
\n" ); document.write( "• Standard deviation =
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Algebra.Com's Answer #780984 by Boreal(15235) $\"\"$ $\"About$

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mean is np=15*0.8=12 people, expected value
\n" ); document.write( "variance is np(1-p) or 12*0.15=1.8
\n" ); document.write( "sd is sqrt (V)= sqrt (1.8)=1.34 \n" ); document.write( "

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