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Posted by on Wednesday, January 26, 2011 at 5:38am.

A manufacturer of light bulbs knows that 3% of the production of their 60W bulbs will be defective. What is the probability that exactly 5 bulbs in a carton of 144 will ne defective?

  • math - , Wednesday, January 26, 2011 at 6:37am

    (0.03)^5*(0.97)^139*144!/(139!*5!)
    = 2.43*10^-8*1.45*10^2*5.77*10^1/120
    = 0.169

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