Question about Texas Instruments TI-83 Plus Calculator

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Binompdf equals 0?

Binompdf (200, .80, 11) = 0? This can't be right can it? Do I have some weird setting that needs to be fixed? Is there really zero probability that 11 random folks will have passed their driving test. That can't be right. What am I doing wrong?

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If the probability of passing the driving test is 0.8, then the probability of exactly 11 people passing the test out of 200 candidates is less than 1 in 10^100, which is zero as far as the calculator is concerned. Is this what you're trying to calculate?

If you want to know the probability that 11 or more people have passed, then you want 1-binomcdf(200,.8,10) which will give you 1 since the probability of 10 or fewer passing is zero.

Think about it. If you have a group of 200 adults, how likely is it that only 11 of them have driver's licenses?

Posted on Mar 20, 2014

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