Question 596421
suppose a mathematician has a 9/10 probability of answering any math questions correctly. What is the probability that he answers exactly 3 out of 5 math questions correctly
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Binomial Problem with n = 5 and p(correct) = 0.9
P(x = 3) = 5C3*0.9^3*0.1^2 = binompdf(5,0.9,3) = 0.0729 

b. 0.0729
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find the geometric means in the following sequence. 
48, ?,?,?,?, -25815552
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a = 48
ar^5 = 48r^5 = -25815552
r^5 = -537824
r = -14
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a = 48
ar = 48*-14 = -672
ar^2 = 9408
ar^3 = -131712
ar^4 = 1843968
ar^5 = -25815552
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Cheers,
Stan H.
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d. 9408,-131712,1843968,-25815567