document.write( "Question 628548: It has been estimated that only about 30% of California residents have adequate earthquake
\n" ); document.write( "supplies. Suppose you randomly survey 11 California residents. We are interested in the
\n" ); document.write( "number who have adequate earthquake supplies.
\n" ); document.write( "d. What is the probability that at least 8 have adequate earthquake supplies?
\n" ); document.write( "e. Is it more likely that none or that all of the residents surveyed will have adequate earthquake
\n" ); document.write( "supplies? Why?\r
\n" ); document.write( "\n" ); document.write( "I tried to do this question by using Binomial Probability Distribution. I took my p as 0.3 and n=11. But it says at least 8 so the probability was P(x>=8) and when i calcualated i got some weird result . If anyone can and have time to do it i would appriciate thank you! \n" ); document.write( "

Algebra.Com's Answer #395714 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "30% of California residents have adequate earthquake supplies...survey 11 of them
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document.write( "P(x ≥ 8) = 11C8(.3)^8(.7)^3 + 11C9(.3)^9(.7)^2 + 11C10(.3)^10(.7)^1 + 11C11(.3)^11
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document.write( "Stattrek.com Bionomial Calculator gives  P(x ≥ 8) = .0043
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document.write( "e. Is it more likely that none or that all of the residents surveyed will have adequate earthquakesupplies? Why?
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document.write( " None (only 30% have them)and ...  P(0)= .02 > P(11)= .0000018 \n" );
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