Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -




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Topic review (newest first)

2012-10-01 22:25:46

THANK YOU!! I see where I messed up now.

2012-10-01 19:50:11


With n = 8 and p = 1 / 3 and trials = 19.

bob bundy
2012-10-01 16:47:11

hi Skyblast72,

That seems to be the right method to me.  I made that 0.133182...

How about you?


2012-10-01 12:44:24

Probability question:

A student takes a 19-question, multiple choice exam with three choices for each question and guesses on each question.  Find the probability of guessing exactly 8 out of 19 correctly.

I used 19C8  so n=19 x =8 p=.33 and q=.67 but I can't come up with any of the answers that are on my homework. 

I am a beginning statistics/probability student.  Showing your work would be helpful to me so I can learn how to do this stuff.  Thanks for any help you are able to give, I appreciate it!

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