Question 386745: 34% of people in the US have type A+ blood. You randomly select 73 people in the US and ask them if their blood type is A+.
A. Use the binomial formula to calculate the probability that between 9 and 12 people (inclusive will say they have A+ blood.
B. Find the probability that at least 30 of these people will say they have A+ blood.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 34% of people in the US have type A+ blood. You randomly select 73 people in the US and ask them if their blood type is A+.
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Binomial Problem with n = 73 and p = 0.34
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A. Use the binomial formula to calculate the probability that between 9 and 12 people (inclusive will say they have A+ blood.
P(9<= x <=12) = binomcdf(73,0.34,12)-binomcdf(73,0.34,8) = 0.0006644
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B. Find the probability that at least 30 of these people will say they have A+ blood.
P(30<= x <=73) = 1 - P(73,0.34,29) = 0.1245
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Cheers,
Stan H.
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