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January 30, 2015

January 30, 2015

Posted by **Tanya** on Saturday, November 19, 2011 at 3:39pm.

What is the probability the student will answer the first question correctly?

What is the probability that the student will answer the first question incorrectly?

- Math -
**Steve**, Saturday, November 19, 2011 at 3:55pmassuming the student is totally ignorant of the subject matter, and guesses randomly, the the chance of a correct answer is 1/5.

That makes it easy to tell what the chance is of a wrong answer.

- Math -
**Tanya**, Saturday, November 19, 2011 at 4:34pmI'm not sure of the second question. I understand the 1/5 chance of answering correctly but I'm not sure of the probability of answering incorrectly. Would it be 1 - 1/5?

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