Please can help me solving my problems(Probality)

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A manufacturer makes mobile phone. The manufacturer employs are inspector to check the quality of its product. The inspector tested a random sample of the phone being defective as 0.049. Ashmita buys three of the phones made by the manufacturer. Find the probability that.
1) At least one of the mobile phone is defective.
2) Exactly one of the mobile phone is defective.

Thank you.

  • Please can help me solving my problems(Probality) -

    Prob(nogood) = .049
    prob(good) = 1-.049 = .951

    1) at least one defective--> 1 - all three are good
    = 1 - .951^3 = .1399

    2) exactly one nogood = C(3,1) (.049)(.951^2) = .1329

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