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9 August, 17:27

A seed packaging company purchases 40% of their beans seeds from supplier A and 60% from supplier B and mixes these seeds together. If the bean seed comes from supplier A, the probability it will germinate is 85%. If the bean seed comes from supplier B, the probability it will germinate is 75%. (a) Find the probability P (G) that a seed selected atrandom from the mixed seeds will germinate.

(b) Given that a seed germinates, find the probability that theseed was purchased from supplier A.

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  1. 9 August, 17:54
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    A) 0.79

    B) 0.43

    Explanation:

    a. P (G) = Seed germinates either from supplier A or supplier B

    P (A chosen) & P (A Seed germinates) or P (B chosen) & P (B seed germinates)

    = (0.40 X 0.85) + (0.60 X 0.75) = 0.34 + 0.45

    = 0.79

    b. P (A/G) = P (G/A) P (A)

    P (G)

    = (0.85 X 0.40) / 0.79 = 0.34 / 0.79

    = 0.43
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