Question 231555
"J.D power and associates says that 60 percent of car buyers now use the internet 
for research and price comparisons. 
Find the probability in a sample of 8 car buyers that:
(A) all 8 use the internet
Ans: 0.6^8
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(B) at least 5 will use the internet
Ans: 1 - binomcdf(8,0.6,4)
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(C) more than 4 will use the internet
Ans: same as (B)
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(D)2 or more will use the internet
Ans: 1 - binomcdf(8,0.6,1)
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(E) The expected number of car buyers who will use the internet
Ans: np = 8*0.6 = 0.48
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(F) The Standard deviation of the buyers who will use the internet"
Ans: sqrt(npq) = sqrt(0.48*0.4) = 1.3856
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Cheers,
Stan H.