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#800. Gender and Handedness Below is survey results about student handedness and their gender. If we select 3 students random

math   Statistics-And-Probability   
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Answer #1

Number of ways to select r items from n, nCr = n!/(r! x (n-r)!)

P(not all three are female) = 1 - P(all three are female)

= 1 - Number of ways to select 3 females from 430 / Number of ways to select any 3 from 729

= 1 - 430C3/729C3

= 1 - 0.20

= 0.80

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