Question 862784
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Hi
{{{15}}} balls: 6R, 4W and 5B
two balls are drawn at random without replacement 
P(2 red)= {{{(6/15)(5/14) = 1/7}}}
P(no blue)= {{{(10/15)(9/14) =  3/7}}}

mean and variance of the distribution of the number of red balls drawn ?
mean= {{{(.4*15) = 6}}}
Sd = {{{sqrt(6(.6))}}} = 1.8974