Question 1043351
30 percent of households say they would feel secure if they had​ $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had​ $50,000 in savings. 
Find the probability that the number that say they would feel secure is​ 
(a) exactly​ five:: p(x = 5) = 8C5*0.3^5*0.7^3 = binompdf(8,0.3,5) = 0.0467 
(b) more than&#8203; five::P(6<=x<=8) = 1 - binomcdf(8,0.3,5) = 0.0113
(c) at most five::P(0<=x<=5) = binomcdf(8,0.3,5) = 0.9887
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Cheers,
Stan H.
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