Posted by Lori on Sunday, September 26, 2010 at 6:47pm.
A student takes a 20question, true/false exam and guessed on each question. Find the probability of passing if the lowest passing grade is 15 correct out of 20.

statistics  PsyDAG, Monday, September 27, 2010 at 12:31pm
What you want to know is the chance probability of obtaining 15, 16, 17, 18, 19, or 20 correct.
Prob. of 15 = .5^15...
Prob. of 20 = .5^20
Eitheror probability = sum of individual probabilities.
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