1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Kept getting the wrong answer? binomial conditional probability

  1. Nov 14, 2011 #1
    Product Testing A supposed coffee connoisseur claims she can distinguish between a cup of instant coffee and a cup of drip coffee 75% of the time. You give her 5 cups of coffee and tell her that you will grant her claim if she correctly identifies at least 4 of the 5 cups.

    (a) What are her chances of having her claim granted if she is in fact only guessing?

    i did
    C(5,4)* .75^4 *.25 get the exactly 4 add .75^5 to get exactly 5.
    i got 0.6328 but my online hw kept saying that it 's wrong.
     
  2. jcsd
  3. Nov 14, 2011 #2
    Hint: consider what would be the probability of success if she was testing a single cup and only guessing.

    Edit: this thread belongs in the homework forums
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Kept getting the wrong answer? binomial conditional probability
  1. Binomial Probability (Replies: 6)

  2. Binomial probability (Replies: 2)

  3. Is the answer wrong? (Replies: 3)

  4. Conditional probability (Replies: 10)

Loading...