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anonymous

  • one year ago

If the probability of hearing a "yes" to a campaign contribution drive is 0.07, and 250 requests are made, what is the probability of getting at least 20 positive responses?

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  1. ybarrap
    • one year ago
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    How are you thinking about solving this problem?

  2. anonymous
    • one year ago
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    honestly, I have no clue...

  3. ybarrap
    • one year ago
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    Have you heard about the Binomial Distribution? https://en.wikipedia.org/wiki/Binomial_distribution You will need this

  4. anonymous
    • one year ago
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    Okay, I think I got this now... kinda

  5. ybarrap
    • one year ago
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    Ok. Tell me.

  6. ybarrap
    • one year ago
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    Just tell me in a sentence, don't worry about the math

  7. anonymous
    • one year ago
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    Sentences in math, oi... its actually easy for write out the equation instead...Not quite sure about this but here is what I got (250/20)*(0.07)^20*(0.93^231)=0.846 Am I right or wrong?

  8. ybarrap
    • one year ago
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    You've got the flavor of it. We need to count all the ways of having more than 20 people out of 250. This is hard. Let's do something easier, let's count the number of ways to have LESS than 20 people. That's easier. That's our strategy.l In a sentence (or two).

  9. ybarrap
    • one year ago
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    Once we have the probability of less or equal 20, we will subtract this from 1 to get the probability of greater than 20.

  10. anonymous
    • one year ago
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    Okay, let me try working something else out real quick

  11. anonymous
    • one year ago
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    I checked with my teacher and she helped me work the problem but thanks for the help, you got me started so i could finish.

  12. ybarrap
    • one year ago
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    You're welcome

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