A teenager is trying to get a driver's license. Write out the formula for the pdf px(k),

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A teenager is trying to get a driver's license. Write out the formula for the pdf px(k), where the random variable X is the number of tries that he needs to pass the road test. Assume that his probability of passing the exam on any given attempt is 0.10. On the average, how many attempts is he likely to require before he gets his license?
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