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Rhesus factor, is a type of protein found on the outside of red blood cells. The protein is genetically inherited. A donor is

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Answer #1

a)

P(X>=3)

= 1 - P(X<=2)

X P(X)
P ( X = 0) = C (7,0) * 0.3^0 * ( 1 - 0.3)^7= 0 0.0824
P ( X = 1) = C (7,1) * 0.3^1 * ( 1 - 0.3)^6= 1 0.2471
P ( X = 2) = C (7,2) * 0.3^2 * ( 1 - 0.3)^5= 2 0.3177

= 0.3529

b)

For 7 students

X P(X)
P ( X = 0) = C (7,0) * 0.3^0 * ( 1 - 0.3)^7= 0 0.0824

= 1 - P(X=0)

= 0.9176

Please let me know in case of any doubt.

Thanks in advance!


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